ASRock unveils motherboard with up to 4 TB of DDR5 — and it fits in a standard PC case

ASRock Rack has demonstrated a motherboard for Intel's upcoming Diamond Rapids Xeon processors that can fit in some standard PC cases and support up to 4 TB of DDR5 memory. The ASRock Rack DMRD16-2L+ packs 16 memory slots onto a 12 × 13-inch board with an EEB form factor, roughly comparable in size to a high-end enthusiast E-ATX motherboard.

The board was showcased at the OCP Global Summit 2026. It uses a single-socket design with 16 memory channels and one DIMM per channel. ASRock Rack lists support for several types of memory modules, including RDIMMs with capacities of up to 128 GB at speeds of up to 8000 MT/s, as well as faster MRDIMMs running at up to 12800 MT/s. It also supports 256 GB MRDIMM 2U modules, allowing to up to 4 TB of memory connected to a single processor.

The board is designed for Intel’s Diamond Rapids Xeon 7 processors, which will succeed the current Granite Rapids server chips. Intel has previously described configurations with up to 256 P-cores and 1.28 GB of last-level cache, The processors are aimed at demanding AI, cloud, and high-performance server workloads. Intel says Diamond Rapids is already being sampled and should ramp up in 2027, although it has not given an exact launch date.

Diamond Rapids will use 16 memory channels, up from 12 on high-end Granite Rapids processors. With second-generation MRDIMMs running at 12800 MT/s, the platform could theoretically reach around 1.6 TB/s of memory bandwidth. Intel has also reportedly dropped its previously planned eight-channel Diamond Rapids platform in favor of 16-channel designs.

The DMRD16-2L+ takes an unusual approach to expansion. Rather than conventional PCIe slots, it features up to 16 MCIO x8 connectors supporting PCIe 6.0 and CXL 3.0, providing a total of 128 lanes for storage, networking, and accelerators. It also includes a PCIe 5.0 x4 M.2 slot, two 1GbE network ports, and an Aspeed AST2700 controller for server management.

ASRock Rack has not announced pricing or availability for the DMRD16-2L+. While the motherboard is primarily designed for high-performance servers rather than regular desktop PCs, its compact E-ATX-like size and large memory capacity could make it an interesting option for high-end workstations, especially as more users build local AI systems.