Crucial Ballistix Elite 4GB Kit (2GBx2) DDR3 1866 MT/s (PC3-14900) CL9 @1.5V UDIMM w/XMP/TS 240-Pin BLE2CP2G3D1869DE1TX0 Designed for extreme enthusiasts, gamers and over - clockers Advanced heat spreader Thermal sensor allows real-time temperature monitoring Custom Ballistix M.O.D. utility to monitor temperature Advanced speeds and timings (XMP Profile)