What are the supported CPU types for this motherboard?

This motherboard supports AMD EPYC 9004 series processors with AMD 3D V-Cache Technology and 97x4 series processors.

What is the maximum memory capacity supported by the AsRock Rack GENOAD8UD-2T/X550 motherboard?

The maximum memory supported is 96GB per DIMM for RDIMM and 512GB per DIMM for RDIMM-3DS.

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AsRock Rack GENOAD8UD-2T/X550 Deep Micro-ATX Server Motherboard Single Socket SP5 (LGA 6096) AMD EPYC™ 9004 series processors Dual 10G Lan

Deep Micro-ATX (10.4" x 10.5")
Support single socket SP5 (LGA 6096), AMD EPYC™ 9004 series processors
Support 8 DIMM slots (1DPC), DDR5 RDIMM, RDIMM-3DS
Support 4 PCIe5.0 / CXL1.1 x16
Support 2 MCIO (PCIe5.0 x8 or 8 SATA 6Gb/s), 2 MCIO (PCIe5.0 x8), 1 MCIO (PCIe5.0 x4)
Support 2 M.2 (PCIe4.0 x4)
Support up to 16 SATA 6Gb/s
Support 2 RJ45 (10GbE) by Intel® X550-AT2
Support ATX PSU or 12V DC-IN
Remote Management (IPMI)