Komputerbay 4GB (2 X 2GB) DDR2 DIMM (240 pin) 800MHZ PC2-6400 PC2-6300 Desktop RAM with Red Heatspreaderss for extra Cooling CL 5-5-5-18 Komputerbay 4GB (2 X 2GB) DDR2 DIMM (240 pin) 800MHZ PC2-6400 PC2-6300 Desktop RAM with Red Heatspreaderss for extra Cooling CL 5-5-5-18 CL 5-5-5-18 Voltage 1.8V Well tested. Non-ECC. Non-parity Lifetime Warranty