Patriot Viper Xtreme Series DDR3 4 GB (1 x 4GB) PC3-12800 1600MHz 8-9-8-24 for Intel P67 Core i5 Core i7 PX34G1600LL Extreme Performance PC3-12800 (1600MHz) Low Latency (8-9-8-24) Voltage: 1.65V XMP Ready Equipped with 6 grams of copper at its core paired with extruded aircraft-grade aluminum outer shield to provide improved cooling 100% Tested and Verified on AMD 890 Series, Intel X58, P55 and P67 platforms RoHS Compliant Lifetime Warranty