ASRock Rack SIENAD8UD3 Deep Micro-ATX server motherboard

Deep Micro-ATX server board for AMD EPYC 8004

The SIENAD8UD3 is a Deep Micro-ATX server motherboard built around a single Socket SP6 (LGA 4844) for AMD EPYC 8004 series processors. It targets compact rack or tower deployments that need server-class compute density. The board delivers eight DDR5 RDIMM slots with a maximum capacity of 768GB at 4800 MT/s. Integrated Aspeed AST2600 graphics and dual 1GbE Intel I210 ports handle remote management and basic connectivity.

Verify CPU cooler clearance and power delivery

Confirm that your chassis can accommodate the 9.6 by 10.5 inch Deep Micro-ATX footprint and a compatible SP6 cooler. The board requires three 8-pin ATX 12V connectors plus a 4-pin ATX signal connector with an included 24-pin adapter cable; alternatively it supports 12V DC-in. Ensure your power supply provides the necessary 12V current for the chosen EPYC 8004 processor and all installed peripherals.

Two PCIe 5.0 x16 slots and flexible storage lanes

Two full-length PCIe 5.0 / CXL 1.1 x16 slots (SLOT4 and SLOT6) accept GPUs, accelerators or high-speed NICs. Four MCIO connectors each offer either PCIe 5.0 x8 or two SATA 6Gb/s ports, while three additional MCIO connectors provide PCIe 5.0 x8. An OCuLink port adds PCIe 3.0 x4, and two M-key M.2 slots support 22110 or 2280 form factors at PCIe 5.0 x4. A front-panel USB 3.2 Gen 1 header supplies two Type-A ports.