XLR8 Performance Memory Modules utilize a heat sink that provides a superior heat extraction for enhanced reliability and endurance under the high-stress conditions that enthusiasts and overclockers subject their systems to. Specifications: Tested Speed: 1600 MHz Latencies: CAS 9 Voltage: 1.65v Compatible with:- PC3-12800 (1600 MHz)- PC3-10666 (1333MHz) DDR3 is the next generation of DDR memory. DDR3 memory features faster speeds, greater bandwidth, lower power consumption and enhanced thermal performance. Although DDR3 modules are the same physical dimension as DDR2 and DDR modules, the plug-in connector configuration is different and as such DDR3 modules are not compatible with PCs requiring DDR2 modules, and vice-versa.