Patriot Viper Xtreme Series DDR3 12 GB (3 x 4 GB) PC3-12800 1600MHz 8-9-8-24 for Intel Core i7 PX7312G1600LLK Equipped with an extruded aluminum shield built around a copper core to provide improved cooling Extreme Performance PC3-12800 (1600MHz) Low Latency (8-9-8-24) XMP Ready Voltage: 1.65V 100% Tested and Verified on Intel X58 chipset w/ Intel Core i7 CPUs Lifetime Warranty