Crucial 2GB Single DDR3 1600 MT/s PC3-12800 CL11 Unbuffered UDIMM 240-Pin Desktop Memory Module CT25664BA160B 2 GB, DDR3 PC3-12800, CL=11, Unbuffered, NON-ECC, DDR3-1600, 1.5V, 256Meg x 64 Memory Type: DDR3 SDRAM - DIMM 240-pin Warranty: Limited Lifetime, 100% Tested Fully buffered : Designed for next-generation servers, features an advanced memory buffer Registered/Buffered : Registered or buffered modules delay all information transferred to the module by one clock cycle Voltage For example 2.6V. Indicates the power used by the module. The lower the better