PNY Optima MD4096KD3-1333 4GB Dual Channel Kit DDR3 1333 MHz PC3-10666 Desktop DIMM Memory Kit Memory capacity upgrade provides improved system performance and responsiveness Deliver all the productivity your PC has to offer with PNY Memory Compatible with PC3-10666 (1333 MHz) systems Helps prepare your PC for running Windows Vista Easy installation, Free 24-hour Technical Support, and Lifetime Warranty!