Crucial Ballistix Elite 16GB Kit (4 x 4GB) DDR3 2133 MT/s (PC3-17000) UDIMM 240-Pin Memory - BLE4K4G3D21BCE1J Cas Latency: 11 Voltage: 1.65V Timing: 11-11-11-27 Buffered/Registered: Unbuffered Heat Spreader: Yes Color: Black Features: BLE4K4G3D21BCE1 is a 16GB kit consisting of (4) 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.