Awesome. Just awesome. Although it's rated at 1600MHz, it runs at 1333 stock. The frostbyte version of this memory runs at 1.5v instead of 1.65v, which gives you headroom. Although this memory isn't a crazy overclocker like the samsung memory, it can hold it's own. At 1.35v it can run at 1600mhz @ c9, which is crazy. Once you get past 1600 though you have to loosen the timings. At 1.5v it can get 1600@c9, 1866@c10, 1999@c11 and 2133@c11. Heat-sink keeps it nice and cool.