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 memory. OWC 8GB UPGRADE: Consists of a single 8GB DDR3 1600 PC3-12800 CL11 1Rx4 240-pin 1.5V ECC Registered DIMM Memory RAM Module Upgrade memory module compatible with Supermicro Motherboard models X9SRG Series, X9SRH Series, X9SRi Series, X9SRL Series And X9SRW Series. 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 number MEMDR380LSL04ER16.