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 32GB UPGRADE: Consists of a single 32GB DDR3L 1600 PC3L-12800 CL11 4Rx4 240-pin 1.35V ECC Load Reduced DIMM Memory RAM Module Upgrade compatible with Cisco UCS models B200 M3, B22 M3, B420 M3, C22 M3 And C220 M3. 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 Cisco part numbers UCSML1X324RYA and UCS-ML-1X324RZ-A.