System: Intel i5 2500K Asrock Z68 Extreme 4 8GB RAM GTX 670 Asus Xonar DX HP LP2475w Antec TP 650 Hi all, I received my new GPU on Wednesday. After running a few games I noticed a problem, namely sound interference. It only develops when I load a game. It is a buzzing sound that varies but is present even when sound is muted. It happens with the onboard sound or the external card. This problem never surfaced with my old GPU (ATI 5770). I am not sure whether the card is defective. Could the PSU cause the above mentioned problem? I don't want to return it until I am sure the card is in fact faulty. Any Suggestions much appreciated. Many thanks for your help.