Product Detail Corsair?s latest high performance heat sink with Dual-Path Heat Xchange (DHX) technology Corsair's most cost competitive DDR3 4GB Kit This memory has been verified to operate at 1333MHz at the low latencies of 9-9-9-24 Lifetime Warranty 4GB Kit DDR3, 1333MHz 2x240 DIMM, unbuffered, 9-9-9-24, matched pair, with Heat Spreader . The "Corsair TW3X4G1333C9 XMS3 4GB 2 X 2 GB PC3-10666 1333Mhz Dual Channel 240-pin DDR3 Desktop Memory" is best product for you. We recommended Corsair TW3X4G1333C9 XMS3 4GB 2 X 2 GB PC3-10666 1333Mhz Dual Channel 240-pin DDR3 Desktop Memory