Patriot PVS24G8500ELKR2 Extreme Performance Viper Series PC2-8500 DDR2 1066MHz 4GB CAS 5-5-5-15 EPP Ready Enhanced Latency Dual Channel Kit (Black) Extreme Performance PC2-8500 (DDR2 1066MHz) Low Latency, (5-5-5-15)@ 2.1V Equipped Patriot Viper Heat Shields with integrated ACC (Aluminum Copper Composite) technology 100% Hand Tested and Verified RoHS Compliant