Mushkin 996907 DDR3 UDIMM (2x4GB) 8GB PC3-8500 Unbuff 7-7-7-20 NONE 1.5V Compatible Frequency This product is engineered to operate at the optimum frequency for compatibility with your system. Compatible Timings This product is programmed to use timings that offer maximum compatibility with your system and original memory. Dual Channel Kit Engineered for dual-channel architecture. Lifetime Warranty Quality guaranteed - we offer a lifetime warranty on this product and genuine, unmatched service and support. Type: DDR3 Voltage: 1.5V Speed Spec: PC3-8500 Frequency: 1066MHz Capacity Kit Type: Dual Kit Module Size: 4GB Module Build: 512x64 Chipset Density: 256x8 Timings tCL: 7 tRCD: 7 tRP: 7 tRAS: 20 Cooling Technology Heatsink: None