ECC LOAD REDUCED 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 REGISTERED memory. OWC 128GB DDR4 3200 PC4-25600 CL22 4Rx4 288-pin 1.2V ECC Load Reduced DIMM Memory RAM Module Upgrade, compatible with Micron part numbers MTA72ASS16G72LZ3G2, MTA72ASS16G72LZ3G2F1 and MTA72ASS16G72LZ3G2B3, Samsung M386AAG40AM3-CWE, M386AAG40BM3-CWE, Hynix HMABAGL7ABR4N-XNT5, HMABAGL7CBR4N-XNT5, Dataram 66976A 66976B 66976C 66976D 100% COMPLIANT: JEDEC-Standard and ROHS Compliant. Warranty-Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs. MAXIMIZE YOUR SERVER: With OWC's ECC Load-Reduced Server Memory, you will extend the life of your old infrastructure or save money when building a new one. INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing.