ASRock Rack SPC621D8 Server Motherboard vs Supermicro X13SCL-F Server Motherboard

These are server boards for different jobs, not rivals at the same tier. The ASRock Rack SPC621D8 is a full ATX Xeon Scalable platform: one LGA 4189 socket, 8 DIMM slots for RDIMM/LRDIMM and Optane, 4 PCIe 4.0 x16 plus 3 x8, and 13 SATA ports. The Supermicro X13SCL-F is a compact micro-ATX board for a single LGA 1700 CPU up to 95W, with 4 DDR5 ECC UDIMM slots capped at 128GB, one PCIe x16, one M.2 and 8 SATA. Owners of the ASRock praise the slot and drive count but note the 1GbE-only networking and the need for a supported Xeon and registered memory. The Supermicro is the simpler, lower-power build, but its single expansion slot and 128GB ceiling limit growth.

• Choose the ASRock Rack SPC621D8 if you need many PCIe 4.0 lanes, lots of SATA drives, or more than 128GB of registered memory for virtualization or storage.
• Choose the Supermicro X13SCL-F if you want a small, quiet, low-power micro-ATX server with DDR5 ECC and one fast M.2 drive.