Corsair XMS3 4GB (2x2GB) DDR3 1333 MHz (PC3 10666) Desktop Memory (TW3X4G1333C9) 4GB XMS Memory kit for dual channel systems, 1333MHz, 9-9-9-24, 1.5V Guaranteed to work on all dual channel Intel and AMD platforms XMS heat spreader Includes two 2GB memory modules Designed for use with all DDR3 motherboards with two memory channels