Corsair Vengeance  8GB (2x4GB)  DDR3 1866 MHZ (PC3 15000) Desktop Memory 8GB Kit (2 x 4GB) DDR3 for AMD, Intel Core i3, i5 and i7 processors, as well as the 2nd generation Intel processor family; Lifetime Warranty SPD Speed: 1333Mhz; SPD Latency: 9-9-9-24; SPD Voltage: 1.5 Volts Tested Speed: 1866Mhz; Tested Latency: 9-10-9-27; Tested Voltage: 1.5 Volts Dual-Channel, 240-Pin, DDR3, DIMM, PC3-15000 (1866MHz); NOTE: To acheive "Tested"/Maximum Speed Rating, may need to enable XMP performance profile Vengeance aluminum heat spreaders for styling and performance; modules are 2.07-inches (52.5mm) tall