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 UPGRADE: Consists of a single 128GB DDR4 2400 PC4-19200 CL17 8Rx4 288-pin 1.2V ECC Load Reduced DIMM Memory RAM Module Upgrade compatible with Fujitsu PRIMERGY models BX2560 M2, BX2580 M2, RX2530 M2, RX2540 M2 And RX2560 M2. 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 Load-Reduced Server Memory, you will extend the life of your old infrastructure or save money when building a new one. Replacement for Fujitsu part numbers S26361-F3935-L517, S26361F3935L617, S26361-F3935-E617 and S26361-F3935-E517.