Corsair 4GB (2x2GB) DDR2 667 MHz (PC2 5300) Desktop Memory 4GB of memory guaranteed to work on all current DDR2 desktops and motherboards Superior performance with maximum memory density offered for current desktops Online 24/7 Customer Support available for your convenience and questions DDR2 667 MHz 4GB 2x2048MB DIMM Unbuffered CL5 5-5-5-18 Lifetime Warranty