Mushkin 996646 DDR3 SODIMM (2x2GB) 4GB PC3-10666 SODIMM 204p 9-9-9-24 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 SODIMM Voltage: 1.5V Speed Spec: PC3-10666 Frequency: 1333MHz Capacity Kit Type: Dual Kit Module Size: 2GB Timings tCL: 9 tRCD: 9 tRP: 9 tRAS: 24 Cooling Technology Heatsink: None