Don't bother overclocking ECC RAM on a server board.

Probably not, and even if you could, it’s not worth the risk.

Server motherboards (Supermicro, ASUS WS, Dell, HPE) are built for stability, not speed. The memory controller on most Xeons is locked, and the board’s BIOS won’t give you the voltage or timings options to push ECC sticks beyond their rated speed. Even on workstation boards that technically allow it (like some ASUS Pro or Gigabyte models), ECC RAM often won’t budge because it’s validated only at JEDEC spec.

You might see an option to set DRAM frequency, but it’ll either get ignored or the system will fail to POST. The real issue is that ECC’s whole job is reliability — overclocking it defeats the purpose. A single bit flip from instability could corrupt data, and you won’t know until something breaks.

If you need faster RAM, just buy the rated speed from the start. The performance bump from 2133 to 2400 is small anyway, and nowhere near worth the headache.