The perfect SP5 motherboard doesn’t exist. You’ll have to decide what your priorities are, and weigh each option against your needs.
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ATX/SSI-CEB options:
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Supermicro H13SSL
ATX / 400W / 12-DIMM@6000 / ??
This generic looking motherboard should be your starting point. It does everything fairly well, but there are usually better options if you want to prioritize one particular use case.
See my previous post for details on Epyc 9005 compatibility. -
Tyan S8050
CEB / 400W / 8-DIMM@6000 / 9005
This one looks a lot like Supermicro’s H13SSL, but has an 8-DIMM memory configuration. Unless you are short on your budget, this one should be avoided. -
Advantech ASMB-831
ATX / 210W / 6-DIMM@4800* / NA
I don’t know why this board even exists.
Lacks Epyc 9005 enablement. -
ASUS K14PA-U12
ATX / 400W / 12-DIMM@4800* / NA
This is the first specialized board on this list. Has 8 MCIO-8I ports for NVMe storage, plus an onboard 2x 25GbE NIC.
Lacks Epyc 9005 enablement. -
ASRock Rack TURIND8UD/GENOAD8UD
M-ATX / 400W / 8-DIMM@6400 / 9005
This 10.4"*10.5" board is one of those boards that ASRock Rack makes for their own amusement. -
ASRock Rack TURIND8QM3/GENOAD8QM3
ATX / 400W / 8-DIMM@6400 / 9005
This board shouldn’t even be in this category. It has an OCP 3.0 slot where PCIe slots should go. It probably fits a standard case, but your IO will be rather limited. -
ASRock Rack TURIND8/BERGAMOD8
ATX / 400W / 8-DIMM@6400or4800* / ??
This is a fairly standard ATX board. Trades 4 DIMM slots for some extra PCIe slots.
BERGAMOD8 lacks Epyc 9005 enablement, but will likely get it in the near future.
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E-ATX/SSE-EEB options:
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Gigabyte MZ33 family
SSI-EEB
-AR0 400W / 24-DIMM@4800-4000-3600 / 9005
-AR1 500W / 24-DIMM@5200-4400-4000 / 9005
-CP0 400W / 16-DIMM@4800-4000-3600 / 9005
-CP1 500W / 12-DIMM@6400 / 9005
This family of boards have impressive IO, and contains AFAIK the only standard form-factor boards with 500W capabilities. The two bottom slots on -CP support full length cards, so you can run a single full-sized GPU on this board. -
ASRock Rack GENOAD8X
SSI-EEB / 400W / 8-DIMM@4800 / 9005
A workstation board with more PCIe slots than you’d ever need. Gives up 4 DIMM slots for this capability, and surprisingly only supports 4800MT/s.
Epyc 9005 enablement in Beta firmware. -
GENOAD24QM32/GENOAD24QM3
SSI-EEB/ 400W / 24-DIMM@5200-4400-4000 / 9005
A larger version of the TURIND8QM3, this one has an extensive array of MCIO-8I slots for storage.