8GB kit DDR3 1333 MT/s Memory Speed: DDR3-1333 (PC3-10600) Number of Modules: 2, Memory Capacity: 8GB (2 x 4GB) Voltage: 1.5V, CAS Latency: 9, Latency: 9-9-9-24 Unbuffered, Non-ECC, 240-pin DIMM, Ballistix Heat Spreader Crucial Lifetime Limited Warranty