ECC REGISTERED UPGRADE: This type of memory is used in Workstations and Servers. It will NOT be compatible with standard desktop computers. Also, it cannot be mixed with UNBUFFERED -or- ECC LOAD REDUCED memory. OWC 512GB UPGRADE: Consists of 8pcs of 64GB DDR4 2933 PC4-23400 CL21 2Rx4 288-pin 1.2V ECC Registered DIMM Memory RAM Module Upgrade compatible with Supermicro Motherboard model H12SST-PS. INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing. MAXIMIZE YOUR SERVER: With OWC's ECC Registered Server Memory, you will extend the life of your old infrastructure or save money when building a new one. Replacement for Supermicro part numbers MEMDR464LCL01ER29 MEMDR464LHL02ER29 MEMDR464LSL01ER29 MEM-DR464MC-ER29.