Komputerbay 4GB 2x 2GB DDR2 PC2 8500 1066Mhz 240 Pin DIMM 4 GB KIT - comes with Heat Spreader for extra Cooling Komputerbay 4GB 2x 2GB DDR2 PC2 8500 1066Mhz 240 Pin DIMM 4 GB KIT - comes with Heat Spreader for extra Cooling Well Tested. Non-ECC Non parity SUPPORTS DUAL CHANNEL Lifetime Warranty Memory Speed: 1066 MHz