This 32GB memory is 100% compatible with MSI Raider X99A.
Memory for Core i7 5th Generation CPU:Optimal performance is achieved by using 4 or 8 identical memories per CPU.If an i7 processor is used, UDIMM memory modules must be installed.Memory for Xeon CPU:When using an XEON CPU, ECC and RDIMM memory must be used. ECC DIMM (with error correction code) or RDIMM (Registered DIMM) RAM memory can be installed in the unit. RDIMM memories are recommended when large memory capacities are to be achieved.The different memory technologies (ECC / RDIMM) must not be mixed.If a memory expansion is to be made with the already existing RAM memories, it must be checked which memory technology (ECC / RDIMM) is available.CPU in the systemUDIMMUDIMM ECCRDIMMWhich memory technology can be used, depending on the CPUCore i...The memory technology that can be used depends on the CPUCore i7-5960XCore i7-5930KCore i7-5820K4GB UDIMM8GB UDIMM16GB UDIMM32GB UDIMM Xeon E5-1600 v3Xeon E5-2600 v3 8GB UDIMM ECC 8GB RDIMM16GB RDIMM32GB RDIMM64GB RDIMM DDP128GB RDIMM 3DS256GB RDIMM 3DS.