Crucial 4GB Single DDR4 2133 MT/s (PC4-2133) CL15 SR x8 ECC Registered DIMM 288-Pin Server Memory CT4G4RFS8213 Capacity: 4 GB Memory Type: DDR4 SDRAM - DIMM 288-pin Upgrade Type: Generic Increased memory bandwidth Reduce power consumption Premium quality memory from a trusted brand Limited Lifetime Warranty, 100% Tested