Mushkin 997028 DDR3 UDIMM 16GB Kit (2x8GB) 1600MHZ PC3-12800 no heatsink 1.5VCompatible 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.Lifetime Warranty Quality guaranteed - we offer a lifetime warranty on this product and genuine, unmatched service and support.Type: DDR3Voltage: 1.5VSpeed Spec: PC3-12800Frequency: 1600MHzCapacity Kit Type: Dual Channel KitModule Size: 8GBTimings tCL: 11 tRCD: 11 tRP: 11 tRAS: 28Cooling TechnologyHeatsink: None