Ballistix Sport XT 4GB Single DDR3 1600 MT/s (PC3-12800) CL9 at 1.5V UDIMM 240-Pin Memory Module BLS4G3D169DS3 Performance memory for gamers and enthusiasts Tall, aggressive heat spreader XMP profile for advanced speeds and timings Premium-quality DRAM Available in 4GB and 8GB DDR3 modules speeds up to 1866 MHz Easy to install Limited Lifetime Warranty