This 64GB memory is 100% compatible with MSI Raider X99A.
Memory for Core i7 5th Generation CPU:You can achieve optimal performance by using 4 or 8 identical memories per CPUUDIMM memory can only be used if you are using a Core i7 processor. Memory for Xeon CPU:You can use ECC and RDIMM memory when using an XEON CPU.ECC memory and RDIMM (Registered) server memory cannot be used together.CPU in the systemUDIMMUDIMM ECCRDIMMWhich memory technology can be used, depending on the CPUCore i7-5960XCore i7-5930KCore i7-5820K4GB UDIMM8GB UDIMM Xeon E5-1600 v3Xeon E5-2600 v3 8GB UDIMM ECC8GB RDIMM16GB RDIMM32GB RDIMM.