This 128GB memory is 100% compatible with ASRock Rack ROMED8U-2T.
The following technical specifications should be considered in advance:RDIMM and RDIMM 3DS (Registered DIMM) or LRDIMM and LRDIMM 3DS (Load Reduced DIMM) RAM memory can be installed in the unit. LRDIMM memories are recommended when large memory capacities are to be achieved.RDIMM and RDIMM 3DS memory modules cannot be operated mixed together with LRDIMM and LRDIMM 3DS RAM.If a memory expansion is to be made with the RAM memories already present, it must be checked which basic memory technology (RDIMM / LRDIMM) is available.