Best single-socket AMD SP4 server motherboards

Top pick: ASRock Rack EPYC4000D4U — the only true single-socket board here, and the one to build around if you're starting fresh. It's AM5, so it takes EPYC 4005/4004 plus Ryzen 9000/8000/7000, and it's the cheapest way into a modern single-socket AMD server platform.

Who the others suit:

• Supermicro MBD-M11SDV-4CT-LN4F — a soldered EPYC 3101 SoC on Mini-ITX: buy it if you want a tiny, low-power box and never plan to swap the CPU.
• ASRock Rack X570D4U — a well-reviewed AM4 board for a budget Ryzen home lab, but it's the weakest match for a true server build.

One caveat worth knowing: none of these is a Socket SP4 board with DDR4 ECC RDIMM slots. SP4 is the embedded EPYC 3000/3451 platform, and those boards (e.g. ASRock Rack EPYC3451D4U) are scarce and often out of stock — if you specifically need SP4 with RDIMM support, that's the part to hunt for, and I'd check availability before committing to a build.