Patriot Viper Xtreme Series DDR3 12 GB (3 x 4 GB) PC3-16000 2000MHz 9-11-9-27 for Intel Core i7 PX7312G2000ELK Equipped with an extruded aluminum shield built around a copper core to provide improved cooling Extreme Performance PC3-16000 (2000MHz) Enhanced Latency (9-11-9-27) XMP Ready Voltage: 1.65V 100% Tested and Verified on Intel X58 chipset w/ Intel Core i7 CPUs Lifetime Warranty