Patriot PVS34G1333LLK Extreme Performance Viper Series PC3-10666 DDR3 1333MHz 4GB CAS 7-7-7-20 Low Latency Dual Channel Kit (Silver) Extreme Performance PC3-10666 (DDR3 1333MHz) Low Latency (7-7-7-20) @ 1.7V Equipped Patriot Viper Heat Shields with integrated ACC (Aluminum Copper Composite) technology 100% Hand Tested and Verified RoHS Compliant Intel XMP Ready