In the last couple of weeks I've noticed that there is a slight ticking sound in what I believe to be my GPU. It only happens when running intense games such as GTA IV or the BF4 Beta, but sometimes it clicks, sometimes it doesn't. I don't think it sounds electrical but I could be wrong. I don't know what else it could be. It couldn't be the PSU could it? My card is an EVGA GTX 650 Ti BOOST with factory overclock. All answers are appreciated.