Externally, this keyboard has succeeded ... but in 2 days it was only about 3-4 times recognized by my system (i5 750+ Asus P7P55D Evo, newest Bios + BeQuiet 650W)! ... And returned on Day 3. The main problem will probably be the power of the keyboard. With 500mA normal USB 2.0 controller are simply overwhelmed. With USB 3.0 you will probably run, as these generally provide 900mA. But I did not and I did not want to upgrade my whole system because of a keyboard! For keyboards and mice must apply, connect and is good! That it comes with less power consumption, Razer shows with BlackWidow Ultimate, 300mA, connected, installed drivers, all the best!