Xiaomi Mix Fold 4 smartphone review - The superlative ultra-thin 8-inch foldable phone
Extremely lightweight foldable phone.
The Mix Fold 4 has an OLED panel almost 8 inches in size, but it is barely any heavier and thicker than a normal high-end phone. The Xiaomi phone, equipped with Leica cameras, doesn't have to hide from a Samsung Galaxy Z Fold 6. But did the Mix Fold fully impress us in our test?Marcus Herbrich, 👁 Florian Schmitt (translated by Daisy Dickson) Published 🇩🇪 🇷🇺 ...
After previously taking a look at the small foldable from Xiaomi's portfolio, it's now time for us to take a look at its big brother. Compared to its predecessor, the Mix Fold 4—with its almost 8-inch OLED panel—has been slimmed down even more. Despite its considerably larger 5,100-mAh battery, the Xiaomi phone weighs 13 grams less than a Samsung Galaxy Z Fold 6. The Mix foldable, which is equipped with the Snapdragon 8 Gen 3, has an introductory price of 9,000 Yuan (approx. US$1,245) for the base version with 12 GB RAM and 256 GB storage. The top-of-the-range version (16 GB RAM, 1 TB storage) retails for approx. US$1,520.
Unfortunately, Xiaomi has no plans to launch the Mix Fold 4 on the international market—unlike the small Mix Flip. However, if you want to call the XXL foldable equipped with Leica Quad cameras your own, you can import it from China. Prices at our partner Trading Shenzhen start at around US$1,360.
Possible competitors compared
Rating | Version | Date | Model | Weight | Drive | Size | Resolution | Price |
|---|---|---|---|---|---|---|---|---|
| 85.3 % | v8 | 10 / 2024 | Xiaomi Mix Fold 4 SD 8 Gen 3, Adreno 750 | 226 g | 512 GB UFS 4.0 Flash | 7.98" | 2488x2224 | |
| 86.3 % | v8 | 09 / 2024 | Honor Magic V3 SD 8 Gen 3, Adreno 750 | 226 g | 512 GB UFS 4.0 Flash | 7.92" | 2344x2156 | |
| 88.8 % v7 (old) | v7 (old) | 05 / 2024 | Vivo X Fold3 SD 8 Gen 2, Adreno 740 | 219 g | 1 TB UFS 4.0 Flash | 8.03" | 2480x2200 | |
| 86.1 % | v8 | 08 / 2024 | Samsung Galaxy Z Fold6 SD 8 Gen 3 for Galaxy, Adreno 750 | 239 g | 512 GB UFS 4.0 Flash | 7.60" | 2160x1856 | |
| 87.3 % v7 (old) | v7 (old) | 11 / 2023 | Xiaomi Mix Fold 3 SD 8 Gen 2, Adreno 740 | 259 g | 512 GB UFS 4.0 Flash | 8.03" | 2160x1916 |
Please note: We have updated our rating system and the results of version 8 are not comparable with the results of version 7. More information is available here.
Case - The Xiaomi Mix Fold 4 is IPX8-certified
For a 7.98-inch foldable smartphone, the Mix Fold 4's weight of only 226 g is super low. The Xiaomi phone weighs a similar amount to the Honor Magic V3. Its case thickness in its folded open state is truly remarkable at only 4.7 millimeters and even when it is folded shut, the Mix Fold 4 barely feels thicker than a conventional smartphone.
Its build quality is first-class. Thanks to its rounded metal frame, the Mix Fold 4 feels very comfortable to hold. The back feels high-quality, although we don't know which materials have been used here. We assume that—similar to the Vivo X Fold 3—Xiaomi has gone for a type of plastic fiber to keep the phone's weight low.
Xiaomi uses its own Dragon Crystal Glass on the front. The same as on the Flip model, Schott UTG is probably used on the inside. Thanks to the narrow bezels around the flexible OLED panel, its display-to-surface ratio is efficient at almost 90 per cent. This is a great value, although a Vivo X Fold 3 looks even more borderless, with a ratio of 91 %.
The Mix Fold 4's new carbon hinge shouldn't only be more robust—according to the manufacturer, the foldable can withstand over 500,000 folds—but it also enables an official IPX8 certification. This means that the case is waterproof and can be used without hesitation when it's pouring outside. Thanks to its limited dust resistance, the Galaxy Z Fold6 has an additional advantage in terms of durability.
The fold on the Mix Fold 4's flexible OLED display is barely visible even after lots of folds and a few days of use, and should hardly be noticeable in everyday life. Compared to the Flip model, however, the display crease is noticeably more pronounced.
Connectivity - The Xiaomi smartphone with USB 3.2
The Mix Fold 4 is well-equipped and features Bluetooth 5.4, NFC and Miracast, as well as an IR blaster. It has LPDDR5X RAM and UFS 4.0 storage. Our test sample's fast storage has a capacity of 512 GB, although users only have 481 GB available as delivered. The Xiaomi cell phone's internal storage can't be expanded. However, memory sticks can be easily connected thanks to USB OTG.
In contrast to its little brother, the XXL foldable has a fast USB standard (3.2 Gen. 1), which supports wired image output to HDMI or DisplayPort interfaces.
Software - The foldable phone with Android 14
The Mix Fold 4 comes with the manufacturer's own HyperOS installed, which is based on the latest Android 14. Version 1.0.11 of HyperOS features a flexible split-screen mode, with which you can have up to four apps open at the same time.
As is usual on Chinese versions of Xiaomi's phones, our test device doesn't come with any Google services or the PlayStore. Instead, it uses Chinese services and Xiaomi's own ones. Even so, the Google frameworks come pre-installed as delivered, so you only have to install the PlayStore manually.
When it comes to software updates, Xiaomi has kept a low profile on its Chinese website (at least for our understanding using Google Translate). The current Xiaomi 14 generation is being supplied with four years of Android upgrades and five years of security patches. It is doubtful whether the Mix Fold 4, which is only available in China, will be similarly sustainable. However, the speed at which patches are rolled out is usually very good with the Chinese ROM—but Xiaomi will not operate at the level of Google or Samsung, even with its Mix Fold 4. At the time of testing, the XXL foldable was running fairly up-to-date security patches from August 2024.
Sustainability
We believe that the Mix Fold 4 comes in outer packaging using no plastic. The accessories are packaged with cardboard material. Xiaomi hasn't provided any information on the phone's CO2 footprint or whether and how many recycled materials are used.
Communication and GNSS - The Xiaomi Mix Fold 4 with 5G
Although the Xiaomi phone uses fast WiFi 7 including MU-MIMO support, we only achieved a decent transmission speed during our measurements—the Mix Fold 4 still has some room for improvement, especially when it comes to transmitting. The reason for this is that its connection is only established via the 2.4 and 5 GHz range. Without the fast and less frequented 6 GHz band, we determined peak transfer rates of around 900 MBit/s in combination with the Asus ROG Rapture GT-AXE11000. However, there is little to criticize when it comes to the consistency of its wireless transmission.
For surfing the web on the go, the foldable phone supports access to the 5G network and a wide range of frequencies—the same applies to the 4G standard. Even LTE bands 20 and 28 are included in the Chinese version. Those who travel a lot should thankfully also rarely be faced with connectivity problems when using the Mix Fold 4. However, the supported satellite communication via the Tiantong-1 system cannot be used for satellite calls or satellite messages in this country.
| Networking | |
| Xiaomi Mix Fold 4 | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| iperf3 transmit AXE11000 6GHz | |
| iperf3 receive AXE11000 6GHz | |
| Honor Magic V3 | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| Vivo X Fold3 | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| Samsung Galaxy Z Fold6 | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| iperf3 transmit AXE11000 6GHz | |
| iperf3 receive AXE11000 6GHz | |
| Xiaomi Mix Fold 3 | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| iperf3 transmit AXE11000 6GHz | |
| iperf3 receive AXE11000 6GHz | |
| Average of class Smartphone | |
| iperf3 receive AXE11000 | |
| iperf3 transmit AXE11000 | |
| iperf3 transmit AXE11000 6GHz | |
| iperf3 receive AXE11000 6GHz | |
The Mix Fold 4 uses all the main satellite systems for positioning: Beidou (B1I + B1C+ B2a), GPS (L1+L5), Galileo (E1+E5) and GLONASS (L1) as well as QZSS (L1 + L5) with a high accuracy of 3 meters. However, the Xiaomi phone's locating abilities during our practical test didn't work quite as well as you would expect from a smartphone with dual GNSS support.
The Mix Fold 4 sometimes mapped the route we traveled with major deviations. At one point, the connection was even lost for a short time. The software probably intervened heavily in the background to keep energy consumption low. The Garmin Venu 2 used for comparison purposes provided a more accurate course. Still, during everyday use, the Xiaomi phone's accuracy should still be sufficient for navigation tasks.
Telephone functions and call quality - The Xiaomi Mix Fold 4 with dual-SIM support
The Xiaomi smartphone comes with fully-fledged dual-SIM support with two nano-SIM card slots—eSIM profiles, on the other hand, can't be added. Its call quality is good and voices are reproduced clearly. The loudspeaker also works reliably. The VoLTE and VoWiFi functions can be used for phone calls.
Cameras - The Xiaomi phone with a Leica collaboration
As you would expect from a foldable smartphone, you can take selfies on the Mix Fold 4 using a front-facing camera and an inner camera. Both feature a resolution of 16 MPix and an aperture of f/2.2. The results look well-balanced and actually quite impressive. However, Xiaomi has its problems with optimal exposure. Thanks to the foldable design, the rear camera module and the cover display can also be used as a viewfinder when unfolded to achieve the best possible results.
A Leica Summilux-branded camera module is used on the back of the device, which houses a 50 MPix main lens with the "Light Hunter 800" including OIS. We have already tested the 1/1.55-inch sensor inside the Redmi K70 Pro, and it comes with an f/1.7 aperture in the Mix Fold 4.
Photos taken using the main camera look really good—especially for a foldable phone. The focus works reliably and the sharpness level is fine. However, the edges of the image appear visibly blurred. Even in low light, the subject is well-lit, and light sources aren't overexposed.
Two macro-capable telephoto lenses are on board for zoom shots. Both feature the in-house Liquid Lens design including a floating lens group. The lenses are divided into two groups that can be moved internally so that the focusing range is from 9 cm to (theoretically) infinity. The 50 MPix sensor for 2x zoom and the 10 MPix periscope lens for 5x magnification offer plenty of detail and good sharpness. The Mix Fold 4's zoom qualities are much better than those of the Mix Flip.
The rear camera module is rounded off by a 12 MPix ultra-wide-angle lens, which corrects lens curvature very well. However, we detected numerous image errors such as chromatic aberrations. The sharpness level isn't terribly pronounced, but it is okay.
The Xiaomi foldable captures moving images using the main camera in a maximum of 8K at 24 fps; video in UHD quality can be recorded at up to 60 frames per second. It is possible to change lenses when recording in UHD at 30 fps, but HDR is only active when you use the main lens.
Image comparison
Choose a scene and navigate within the first image. One click changes the position on touchscreens. One click on the zoomed-in image opens the original in a new window. The first image shows the scaled photograph of the test device.
Main cameraMain cameraLow lightScene 4
In controlled lighting conditions, we analyzed the main camera's color representation in comparison to the actual reference colors. The 50 MP lens revealed a brightening and oversaturation when depicting the ColorChecker Passport, especially in the green and blue tones. The Mix Fold 4 had a few outliers regarding color accuracy (>10).
Accessories and warranty - The Mix Fold 4 with a power supply
The scope of delivery includes a 67-watt fast-charging power supply (5V/3A, 5-20V/6.2-3.25A), a data/charging cable (USB-C to USB-C), a SIM tool as well as a short instruction manual. In addition, both screens come with screen protectors preinstalled. Our loaner Trading Shenzhen added an EU adapter for the phone's charger and a USB OTG adapter to the scope of delivery of our Chinese test device.
Our import device has a 12-month warranty. In the event of a warranty claim, Trading Shenzhen offers the option of sending the smartphone to a German shipping address.
Input devices & operation - The Xiaomi smartphone with Face Unlock
The two capacitive touchscreens, both with a sampling rate of up to 240 Hz, respond quickly and animations and scrolling through the menus are displayed very smoothly thanks to the 120 Hz panels. Unfortunately, the Xiaomi Smart Pen isn't supported on the Mix Fold 4. Those who value stylus operation would be better off with the Galaxy Z Fold6 with its S Pen.
The Flex mode known from Samsung, which is an additional screen option when folding the device, is also supported by the Xiaomi phone. The manufacturer calls this hover mode, but the hinge is not as rigid as on the Galaxy phones. You can use it at a 90-degree angle, but nothing more. A small, linear electric motor (x-axis) is responsible for vibrations, which provides crisp haptic feedback. Anyone potentially interested in a Mix Fold 4 should be aware before purchasing that the 7.98-inch screen is less suitable for most apps due to its unusual aspect ratio.
Biometric security is taken care of via a face unlock function that relies on 2D technology using the two 16 MPix cameras, or a fingerprint sensor housed inside the on/off button. The capacitive sensor works reliably and unlocks the foldable very quickly.
Display - The Mix Fold 4 uses OLED
The dynamic 7.98-inch flex display on the inside of the phone has a resolution of 2,488 x 2,224 pixels, resulting in a high sharpness of 418 ppi. The foldable screen is an LTPO panel (10-bit), which can adjust its refresh rate variably between 1 and 120 Hz.
During our measurements, the Mix Fold 4 managed a brightness of 1,986 cd/m² (APL18), which is slightly higher than Xiaomi's specifications (1,700 nits, HBM). The advertised peak brightness of 3,000 nits is usually only possible when playing HDR content. The 7.98-inch flex display supports the following formats: Dolby Vision, HDR10+ and HDR Vivid.
To protect your eyes when viewing the flickering OLED panel, Xiaomi relies on high-frequency PWM dimming, which nominally works at up to 2,160 Hz. However, we also detected low-frequency flickering at 120 Hz in our measurement, which is probably due to black frame insertion (BFI)—this technology is used, among other things, as burn-in protection for organic displays. The amplitude of the PWM is relatively flat for an AMOLED screen, at 15 per cent.
| |||||||||||||||||||||||||
Brightness Distribution: 99 %
Center on Battery: 1111 cd/m²
Contrast: ∞:1 (Black: 0 cd/m²)
ΔE Color 3.42 | 0.5-29.43 Ø4.83
ΔE Greyscale 2.7 | 0.09-98 Ø5.1
99.9% sRGB (Calman 2D)
Gamma: 2.206
| Xiaomi Mix Fold 4 AMOLED LPTO, 2488x2224, 8" | Honor Magic V3 OLED, 2344x2156, 7.9" | Vivo X Fold3 AMOLED, 2480x2200, 8" | Samsung Galaxy Z Fold6 AMOLED, HDR - HDR10+, HGL, 2nd Screen: 6.3", 2376x968, Glass Victus 2, 2160x1856, 7.6" | Xiaomi Mix Fold 3 AMOLED, 2160x1916, 8" | |
|---|---|---|---|---|---|
| Screen | 25% | 50% | 32% | 36% | |
| Brightness middle | 1111 | 1019 -8% | 1793 61% | 1396 26% | 1307 18% |
| Brightness | 1120 | 1032 -8% | 1806 61% | 1387 24% | 1308 17% |
| Brightness Distribution | 99 | 95 -4% | 99 0% | 89 -10% | 96 -3% |
| Black Level * | |||||
| Colorchecker dE 2000 * | 3.42 | 1 71% | 0.9 74% | 1.7 50% | 1 71% |
| Colorchecker dE 2000 max. * | 5.92 | 2.2 63% | 2.1 65% | 2.5 58% | 1.7 71% |
| Greyscale dE 2000 * | 2.7 | 1.7 37% | 1.6 41% | 1.5 44% | 1.5 44% |
| Gamma | 2.206 100% | 2.26 97% | 2.2 100% | 2.16 102% | 2.24 98% |
| CCT | 7081 92% | 6473 100% | 6595 99% | 6495 100% | 6313 103% |
* ... smaller is better
Screen Flickering / PWM (Pulse-Width Modulation)
| Screen flickering / PWM detected | 120 Hz Amplitude: 15 % |  | |
The display backlight flickers at 120 Hz (worst case, e.g., utilizing PWM) . The frequency of 120 Hz is very low, so the flickering may cause eyestrain and headaches after extended use. In comparison: 53 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 8350 (minimum: 5 - maximum: 343500) Hz was measured. | |||
Measurement series with fixed zoom level and different brightness settings
We examined the display's color calibration with the Calman analysis software and a photo spectrometer. The deviations were satisfactorily low, although its predecessor proved to be calibrated more accurately in our test. In terms of adaptability, however, the HyperOS interface is still exemplary. In addition to three color profiles, users can individually adjust specific parameters such as saturation and individual color values in Advanced mode. Color adjustment to the ambient light can also be selected if desired.
Display Response Times
| ↔ Response Time Black to White | ||
|---|---|---|
| 3.7 ms ... rise ↗ and fall ↘ combined | ↗ 1.3 ms rise |  |
| ↘ 2.4 ms fall | ||
| The screen shows very fast response rates in our tests and should be very well suited for fast-paced gaming. In comparison, all tested devices range from 0.1 (minimum) to 240 (maximum) ms. » 14 % of all devices are better. This means that the measured response time is better than the average of all tested devices (20.5 ms). | ||
| ↔ Response Time 50% Grey to 80% Grey | ||
| 11.2 ms ... rise ↗ and fall ↘ combined | ↗ 1.5 ms rise |  |
| ↘ 9.7 ms fall | ||
| The screen shows good response rates in our tests, but may be too slow for competitive gamers. In comparison, all tested devices range from 0.165 (minimum) to 636 (maximum) ms. » 23 % of all devices are better. This means that the measured response time is better than the average of all tested devices (32.1 ms). | ||
The Mix Fold 4 made a strong impression outside. In our sample photos under autumn sunlight, the Flex OLED panel showed sufficient brightness reserves to ensure good readability. Its viewing-angle stability and illumination are very good. No changes in its colors could be observed.
Cover display - The Mix Fold 4 relies on AMOLED
The 21:9 cover display on the outside also has a dynamic OLED panel with a size of 6.56 inches and a resolution of 2,520 x 1,080 pixels. In our test, the AMOLED display—like the main screen—showed a minimum refresh rate of 1 Hz. According to the manufacturer, its peak brightness is 3,000 nits; in our measurement with a white background, the panel performed slightly worse than its big brother on the inside, at 998 cd/m².
The cover display is also not spared from PWM flickering, although high-frequency PWM dimming (2,160 Hz) is used once more.
| |||||||||||||||||||||||||
Brightness Distribution: 96 %
Center on Battery: 968 cd/m²
Contrast: ∞:1 (Black: 0 cd/m²)
ΔE Color 3.28 | 0.5-29.43 Ø4.83
ΔE Greyscale 2.9 | 0.09-98 Ø5.1
99.9% sRGB (Calman 2D)
Gamma: 2.238
The external display's color calibration is similarly accurate to that of the main display. The same applies to its great viewing-angle stability. A slight loss of brightness can only be seen when viewed from a very flat angle. Color distortions don't occur during everyday use. Thanks to the screen's high brightness and strong contrasts, even reflections are hardly an issue.
Performance - The foldable phone with a Qualcomm SoC
The Snapdragon 8 Gen 3 installed in the Mix Fold 4 is supported by 16 GB of LPDDR5x RAM in our case. During the benchmarks, the Xiaomi phone wasn't quite able to come close to the scores of a Galaxy Z Fold6 with the For Galaxy edition of the SoC, but its results were nevertheless still very strong. The Mix Fold 4 delivered significantly better results than the Honor Magic V3 in performance mode, especially in the Geekbench multi-core test.
| UL Procyon AI Inference for Android - Overall Score NNAPI | |
| Average of class Smartphone (1267 - 81594, n=145, last 2 years) | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Average Qualcomm Snapdragon 8 Gen 3 (11487 - 18370, n=20) | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| Geekbench AI | |
| Single Precision TensorFlow NNAPI 1.1 | |
| Average of class Smartphone (122 - 4122, n=41, last 2 years) | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| Honor Magic V3 | |
| Average Qualcomm Snapdragon 8 Gen 3 (243 - 489, n=8) | |
| Half Precision TensorFlow NNAPI 1.1 | |
| Average of class Smartphone (122 - 32120, n=41, last 2 years) | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| Honor Magic V3 | |
| Average Qualcomm Snapdragon 8 Gen 3 (227 - 498, n=8) | |
| Quantized TensorFlow NNAPI 1.1 | |
| Average of class Smartphone (118 - 44381, n=41, last 2 years) | |
| Honor Magic V3 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 4 | |
| Average Qualcomm Snapdragon 8 Gen 3 (508 - 1128, n=8) | |
The integrated Adreno 750 graphics unit proved to be powerful during our benchmarks, although a throttling of the system was already revealed in the demanding 3DMark tests. Due to the foldable OLED panel's high resolution, the values are rather subdued compared to a high-end phone. However, using the cover screen of the Mix Fold 4 resulted in almost twice as high values (98 fps) in the high-tier on-screen test, for example.
GFXBench (DX / GLBenchmark) 2.7: T-Rex Onscreen | 1920x1080 T-Rex Offscreen
GFXBench 3.0: on screen Manhattan Onscreen OGL | 1920x1080 1080p Manhattan Offscreen
GFXBench 3.1: on screen Manhattan ES 3.1 Onscreen | 1920x1080 Manhattan ES 3.1 Offscreen
GFXBench: on screen Car Chase Onscreen | 1920x1080 Car Chase Offscreen | on screen Aztec Ruins High Tier Onscreen | 2560x1440 Aztec Ruins High Tier Offscreen | on screen Aztec Ruins Normal Tier Onscreen | 1920x1080 Aztec Ruins Normal Tier Offscreen | 3840x2160 4K Aztec Ruins High Tier Offscreen
| 3DMark / Wild Life Extreme Unlimited | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| 3DMark / Wild Life Extreme | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| 3DMark / Wild Life Unlimited Score | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 4 | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| 3DMark / Solar Bay Score | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| 3DMark / Solar Bay Unlimited Score | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 4 | |
| Vivo X Fold3 | |
| 3DMark / Steel Nomad Light Unlimited Score | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Honor Magic V3 | |
| 3DMark / Steel Nomad Light Score | |
| Honor Magic V3 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| GFXBench (DX / GLBenchmark) 2.7 / T-Rex Onscreen | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| GFXBench (DX / GLBenchmark) 2.7 / T-Rex Offscreen | |
| Xiaomi Mix Fold 4 | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| GFXBench 3.0 / Manhattan Onscreen OGL | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| GFXBench 3.0 / 1080p Manhattan Offscreen | |
| Xiaomi Mix Fold 4 | |
| Vivo X Fold3 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 3 | |
| Honor Magic V3 | |
| GFXBench 3.1 / Manhattan ES 3.1 Onscreen | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| GFXBench 3.1 / Manhattan ES 3.1 Offscreen | |
| Xiaomi Mix Fold 4 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Xiaomi Mix Fold 3 | |
| Honor Magic V3 | |
| GFXBench / Car Chase Onscreen | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| GFXBench / Car Chase Offscreen | |
| Xiaomi Mix Fold 4 | |
| Xiaomi Mix Fold 3 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| GFXBench / Aztec Ruins High Tier Onscreen | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Honor Magic V3 | |
| Vivo X Fold3 | |
| GFXBench / Aztec Ruins High Tier Offscreen | |
| Samsung Galaxy Z Fold6 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Vivo X Fold3 | |
| GFXBench / Aztec Ruins Normal Tier Onscreen | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 3 | |
| Xiaomi Mix Fold 4 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| GFXBench / Aztec Ruins Normal Tier Offscreen | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 3 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 4 | |
| Vivo X Fold3 | |
| GFXBench / 4K Aztec Ruins High Tier Offscreen | |
| Honor Magic V3 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 4 | |
| Xiaomi Mix Fold 3 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
The results of the browser benchmarks reflect the Mix Fold 4's quick surfing speeds. The Xiaomi phone performed very well here.
| Jetstream 2 - 2.0 Total Score | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
| Xiaomi Mix Fold 3 (Chrome 118.0.05993.111) | |
| Average Qualcomm Snapdragon 8 Gen 3 (64.1 - 241, n=24) | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Average of class Smartphone (13.8 - 387, n=158, last 2 years) | |
| Vivo X Fold3 (Chrome 124) | |
| Honor Magic V3 (Chrome 128) | |
| Honor Magic V3 (Performance Mode, Chrome 128) | |
| Speedometer 2.0 - Result | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Average Qualcomm Snapdragon 8 Gen 3 (69.6 - 311, n=19) | |
| Xiaomi Mix Fold 3 (Chrome 118.0.05993.111) | |
| Vivo X Fold3 | |
| Average of class Smartphone (15.2 - 585, n=140, last 2 years) | |
| Honor Magic V3 (Chrome 128) | |
| Speedometer 3.0 - Score | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Average of class Smartphone (1.03 - 34, n=104, last 2 years) | |
| Average Qualcomm Snapdragon 8 Gen 3 (4.3 - 18.9, n=14) | |
| Vivo X Fold3 (Chrome 124) | |
| Honor Magic V3 (Chrome 128) | |
| WebXPRT 4 - Overall | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
| Xiaomi Mix Fold 3 (Chrome 118.0.05993.111) | |
| Average Qualcomm Snapdragon 8 Gen 3 (69 - 212, n=20) | |
| Vivo X Fold3 (Chrome 124) | |
| Average of class Smartphone (22 - 273, n=152, last 2 years) | |
| Honor Magic V3 (Chrome 128) | |
| Octane V2 - Total Score | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Xiaomi Mix Fold 3 (Chrome 118.0.05993.111) | |
| Average Qualcomm Snapdragon 8 Gen 3 (25953 - 72665, n=24) | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
| Vivo X Fold3 (Chrome 124) | |
| Average of class Smartphone (2228 - 100368, n=205, last 2 years) | |
| Honor Magic V3 (Chrome 128) | |
| Mozilla Kraken 1.1 - Total | |
| Honor Magic V3 (Chrome 128) | |
| Average of class Smartphone (277 - 28190, n=161, last 2 years) | |
| Average Qualcomm Snapdragon 8 Gen 3 (510 - 2066, n=22) | |
| Vivo X Fold3 (Chrome 124) | |
| Xiaomi Mix Fold 3 (Chrome 118.0.05993.111) | |
| Samsung Galaxy Z Fold6 (Chrom 127) | |
| Xiaomi Mix Fold 4 (Chrome 129) | |
* ... smaller is better
The Mix Fold 4 relies on very fast UFS 4.0 storage, which delivered consistently high speeds during our measurements.
| Xiaomi Mix Fold 4 | Honor Magic V3 | Vivo X Fold3 | Samsung Galaxy Z Fold6 | Xiaomi Mix Fold 3 | Average 512 GB UFS 4.0 Flash | Average of class Smartphone | |
|---|---|---|---|---|---|---|---|
| AndroBench 3-5 | 4% | -2% | -28% | -2% | -2% | -36% | |
| Sequential Read 256KB | 3984.91 | 3825.59 -4% | 3556.73 -11% | 4115.34 3% | 3572.73 -10% | 3679 ? -8% | 2135 ? -46% |
| Sequential Write 256KB | 3073.45 | 3393.12 10% | 3076.11 0% | 2083.25 -32% | 2897.27 -6% | 3102 ? 1% | 1729 ? -44% |
| Random Read 4KB | 369.73 | 365.48 -1% | 387.96 5% | 398.01 8% | 389.81 5% | 382 ? 3% | 292 ? -21% |
| Random Write 4KB | 485.32 | 527.68 9% | 486.21 0% | 45.73 -91% | 506.41 4% | 469 ? -3% | 334 ? -31% |
Games - The Xiaomi Mix Fold 4 doesn't manage 120 fps
We used the GameBench app to see how smoothly games run on the Mix Fold 4's 7.98-inch display and whether the Xiaomi foldable is suitable for HFR gaming. We did not achieve the maximum possible 120 fps in our recording. However, the Android games we tested run more smoothly and consistently than on the Flip model.
The graphically demanding Genshin Impact was easy to play at high graphics settings, but graphics errors and slight frame drops crept in from time to time in the fantasy action role-playing game. In our second game, PUBG mobile, the UHD mode was unlocked and the "extreme" frame rate was available at low graphics settings. This allowed us to reach 90 fps for a very short time but after that, the Mix Fold 4 only managed around 50 fps. There obviously seems to be a lack of optimization on the software side here.
Emissions - The Xiaomi phone with a hotspot area
Temperature
The Mix Fold 4 features a vacuum chamber liquid cooling unit, which keeps the foldable's case quite cool during everyday use. However, we noted a pronounced hotspot area around the camera. During our load scenario, we measured over 53 °C at the peak. This high heat development, which we determined after a one-hour stress test using the Burnout benchmark, also led to significant losses in performance during the 3DMark benchmarks. The stress tests resulted in a thermally induced throttling of around 50 per cent.
(-) The maximum temperature on the upper side is 53.6 °C / 128 F, compared to the average of 35.1 °C / 95 F, ranging from 21.9 to 63.7 °C for the class Smartphone.
(±) The bottom heats up to a maximum of 44.7 °C / 112 F, compared to the average of 34.1 °C / 93 F
(+) In idle usage, the average temperature for the upper side is 26 °C / 79 F, compared to the device average of 32.8 °C / 91 F.
3DMark Steel Nomad Stress Test
| 3DMark | |
| Wild Life Stress Test Stability | |
| Xiaomi Mix Fold 3 | |
| Samsung Galaxy Z Fold6 | |
| Honor Magic V3 | |
| Vivo X Fold3 | |
| Xiaomi Mix Fold 4 | |
| Wild Life Extreme Stress Test | |
| Xiaomi Mix Fold 3 | |
| Samsung Galaxy Z Fold6 | |
| Vivo X Fold3 | |
| Honor Magic V3 | |
| Xiaomi Mix Fold 4 | |
| Solar Bay Stress Test Stability | |
| Samsung Galaxy Z Fold6 | |
| Honor Magic V3 | |
| Vivo X Fold3 | |
| Xiaomi Mix Fold 4 | |
| Steel Nomad Light Stress Test Stability | |
| Honor Magic V3 | |
| Samsung Galaxy Z Fold6 | |
| Xiaomi Mix Fold 4 | |
Speakers
The two speakers inside the Mix Fold 4 deliver good sound with light bass and linear mids and highs. Wired headphones can be connected via the USB port. If you prefer to use Bluetooth for wireless audio output, you can choose from a wide range of codecs (SBC, AAC, AptX, AptX HD, AptX Adaptive, LDAC, LHDC V5, LC3) and Auracast.
Xiaomi Mix Fold 4 audio analysis
(±) | speaker loudness is average but good (79.2 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 15.7% lower than median
(±) | linearity of bass is average (14.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 6.3% higher than median
(+) | mids are linear (5.5% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2.4% away from median
(±) | linearity of highs is average (7.2% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (18.4% difference to median)
Compared to same class
» 17% of all tested devices in this class were better, 9% similar, 73% worse
» The best had a delta of 12%, average was 36%, worst was 134%
Compared to all devices tested
» 39% of all tested devices were better, 8% similar, 54% worse
» The best had a delta of 4%, average was 24%, worst was 134%
Xiaomi Mix Fold 3 audio analysis
(+) | speakers can play relatively loud (87 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 26.8% lower than median
(±) | linearity of bass is average (9.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.8% away from median
(+) | mids are linear (5.8% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2.1% away from median
(+) | highs are linear (1.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (15.5% difference to median)
Compared to same class
» 3% of all tested devices in this class were better, 2% similar, 95% worse
» The best had a delta of 12%, average was 36%, worst was 134%
Compared to all devices tested
» 21% of all tested devices were better, 4% similar, 75% worse
» The best had a delta of 4%, average was 24%, worst was 134%
Battery life
Power consumption
The Mix Fold 4 supports wireless charging at up to 50 watts and wired charging at a maximum of 67 watts. With the included fast charging adapter, we needed around 55 minutes to recharge the 5,100 mAh battery during our test, reaching around 60 per cent after 30 minutes. If you don't want to use an adapter for the Chinese plug, you can also use standard fast-charging power adapters (QC 2-4, PD2.0, PD3.0, PPS) with the Xiaomi phone.
We measured the power consumption of the Mix Fold 4 with its large main screen. Its power consumption under load is relatively low for a foldable XXL phone at around 6.5 watts, but its predecessor shows that things can be even more frugal, coming in at around 1 watt when idle.
| Off / Standby |   0.1 / 0.2 Watt |
| Idle |  1.5 / 1.9 / 2.6 Watt |
| Load |
5.8 / 11.2 Watt |
    
| |
Key:
min: ,
med: ,
max: Metrahit Energy | |
| Xiaomi Mix Fold 4 5100 mAh | Honor Magic V3 5150 mAh | Vivo X Fold3 5500 mAh | Samsung Galaxy Z Fold6 4400 mAh | Xiaomi Mix Fold 3 4800 mAh | Average Qualcomm Snapdragon 8 Gen 3 | Average of class Smartphone | |
|---|---|---|---|---|---|---|---|
| Power Consumption | 25% | 16% | -11% | -15% | 10% | 17% | |
| Idle Minimum * | 1.5 | 1.12 25% | 0.91 39% | 0.83 45% | 0.86 43% | 0.929 ? 38% | 0.87 ? 42% |
| Idle Average * | 1.9 | 1.58 17% | 1.61 15% | 1.3 32% | 1.05 45% | 1.374 ? 28% | 1.424 ? 25% |
| Idle Maximum * | 2.6 | 1.66 36% | 1.7 35% | 1.44 45% | 1.07 59% | 1.54 ? 41% | 1.586 ? 39% |
| Load Average * | 5.8 | 5.9 -2% | 6.36 -10% | 13.57 -134% | 15.27 -163% | 8.82 ? -52% | 7.13 ? -23% |
| Load Maximum * | 11.2 | 5.94 47% | 11.26 -1% | 16.03 -43% | 17.78 -59% | 11.5 ? -3% | 10.8 ? 4% |
* ... smaller is better
Power consumption: Geekbench (150 cd/m²)
Power consumption: GFXBench (150 cd/m²)
Runtimes
The foldable phone's runtimes using the 7.98-inch display and an adjusted display brightness of 150 cd/m² were on par with its predecessor, with 16 hours during the WLAN test and almost 24 hours of video playback—our comparison devices are best compared with uniform brightness.
| Xiaomi Mix Fold 4 5100 mAh | Honor Magic V3 5150 mAh | Vivo X Fold3 5500 mAh | Samsung Galaxy Z Fold6 4400 mAh | Xiaomi Mix Fold 3 4800 mAh | |
|---|---|---|---|---|---|
| Battery Runtime | -17% | -22% | -6% | 1% | |
| Reader / Idle | 2067 | 1692 -18% | 2132 3% | ||
| H.264 | 1421 | 1043 -27% | 1371 -4% | ||
| WiFi v1.3 | 968 | 830 -14% | 757 -22% | 913 -6% | 923 -5% |
| Load | 244 | 223 -9% | 270 11% |
Pros
Cons
Verdict on the Xiaomi Mix Fold 4
Thanks to its impressive build, the Mix Fold 4 is one of the most exciting foldable smartphones on the market. Compared to the Galaxy Z Fold 6, the Xiaomi phone truly feels like the next generation of foldable phones when it comes to weight and case thickness. Although the Mix Fold 4's new carbon hinge enables it to have an IPX8 certification, this does come at the cost of a relatively noticeable crease—which is barely visible anymore on the Flip model.
For a foldable phone, Xiaomi has equipped its 7.98-inch smartphone with a really good Leica camera module and great connectivity. During everyday use, however, the Mix Fold 4 can't always uphold the high standards its datasheet suggests—for example, the WiFi 7 standard lacks 6 GHz support and the dual GNSS delivers unexpected inaccuracies in practice. However, its very long runtimes in combination with its fast charging functions and the matching power supply unit are a big plus point for the Mix Fold 4.
The Mix Fold 4 shows the potential of future XXL foldables. However, a somewhat more common aspect ratio in tablet format would be desirable.
Due to its extremely thin design, the Xiaomi foldable phone has the same problems as an Honor Magic V3, namely the Snapdragon 8 Gen 3's high throttling and pronounced heat development. In addition, Xiaomi isn't allowing its XXL folding phone to have a global market launch, so its system languages are limited to English. In this respect, the Vivo X Fold 3, which is also only available as an import device, has an advantage with its multi-language support.
Price and availability
You can purchase the Xiaomi Mix Fold 4 as an import device for around US$1,360, for example via Trading Shenzhen.
Please note: We have updated our rating system and the results of version 8 are not comparable with the results of version 7. More information is available here.
Xiaomi Mix Fold 4
- 10/02/2024 v8
Marcus Herbrich
Total Sustainability Score: 
Transparency
The selection of devices to be reviewed is made by our editorial team. The test sample was provided to the author as a loan by the manufacturer or retailer for the purpose of this review. The lender had no influence on this review, nor did the manufacturer receive a copy of this review before publication. There was no obligation to publish this review. We never accept compensation or payment in return for our reviews. As an independent media company, Notebookcheck is not subjected to the authority of manufacturers, retailers or publishers.
This is how Notebookcheck is testing
Every year, Notebookcheck independently reviews hundreds of laptops and smartphones using standardized procedures to ensure that all results are comparable. We have continuously developed our test methods for around 20 years and set industry standards in the process. In our test labs, high-quality measuring equipment is utilized by experienced technicians and editors. These tests involve a multi-stage validation process. Our complex rating system is based on hundreds of well-founded measurements and benchmarks, which maintains objectivity. Further information on our test methods can be found here.
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