I needed to replace the fan in an inexpensive computer power supply as the existing one of the same size was beginning to rattle. Initially I wasn't sure whether the Fractal Design R3 was meant to be used as a case fan or as a PSU fan, but the seller says it can do either and that is what attracted me to it. I fitted the new fan and tested it for many hours with no problems. It is very quiet and the LEDs emit an attractive green, blue or red light - particularly effective if you're using it as a case fan at the front of the computer case. Its low price makes it great value for money and in my case made the repair of the old PSU worthwhile.