Have the part bought in order to support my GTX460 me, the system had so actually only 550 watts needed. Noise was OK. Have not much used the device. A week ago, the PC is, after a short operation (ie not run hot) assumed. When you turn initially Thats has a short buzz, now already nothing more from him. Old installed power supply and juice is back.
Conclusion: Well, unfortunately, saves on the wrong end. I am a penitent row in the list of buyers who report a defective device. An AC adapter should still hold at least 5 years.