Features: BLT2K4G3D21BCT1J is an 8GB kit consisting of (2) 4GB DDR3 Performance modules that operates at speeds up to 2133 MT/s and has a CL11 latency with extended timings of 11-11-11-27. It is Performance and is non-ECC. It conforms to the industry standard UDIMM layout of 240 pins and is compatible with computers that take DDR3 UDIMM memory.