Kingston 4GB (2x 2GB) DDR3 1600 M Hz/PC3-12800 Hyper X Memory Kit CL9 (9-9-9-27) Hyper X is the ultimate memory solution engineered to support the most advanced desktop computers. Not all memory modules are built the same. While ‘standard’ memory is built with ‘standard’ electronic components, Hyper X uses DRAMs that have been diagnosed to deliver higher frequencies & lower latencies – attributes which are critical to desktops capable of high speeds. Hyper X benefits from Kingston Technology’s reputation on delivering premium quality memory modules, emphasising high-effectiveness 100 per cent production testing for all shipped modules. That is every cell on every chip on every Hyper X modules is 100% production tested. Hyper X modules carry a lifetime warranty.