DDR3, 1333MHz 16GB 4x240 DIMM, Unbuffered, 9-9-9-24, XMS3 with Classic Heat Spreader - Core i7, Core i5 and Core 2 / AMD Phenom II - Dual Channel Specifications Density: 16GB (4x4GB Module) Speed: 1333MHz Timing: 9-9-9-24 Type: DDR3 Format: DIMM Pin Out: 240 Pin Voltage: 1.5V