I just bought a new PSU and GPU for my PC. I got a Cooler Master 460W PSU and a Nvidia GTX 660. I can run any game I play smoothly on high settings, no FPS issues or lag at all. How ever.. my PSU makes a strange noise.. but only under load, like when playing a GPU intense game. It kind of sounds like an electrical arc. Or static popping/buzzing. Is this potentially harmful to my pc? Like I said, I haven't had any issues with performance.. OR could it just mean I need a stronger PSU?