Try looking inside the unit in the dark to confirm this (although you may not be able to see internal arcing anyway). Originally posted by RGX12:That said, if it's not the fan, and you think it sounds like sizzling, something in the PSU could be arcing. However, that would sound like (movement in games / activities will change the whine pitch): Again it would require RMA on either the PSU or GPU (if it's load enough and they accept it). A poorly regulated/faulty PSU can cause a GPU to whine under load or it can just be the graphics card itself. However, it's more likely to be a wire sitting on a fan or broken fan blade.Īnother case is harmless, but very annoying. As if it's something like a damaged rail, then it could fry other components on your motherboard or graphics card. If there is an issue with the PSU, don't ignore it, RMA as soon as possible. Since it's occurring during gaming, that means it's either when a fan (on PSU or GPU) is ramping up to keep it cool or your PCI-e rails (the ports used by the cables that go to your graphics card) on the PSU are damaged.

Then open the side of the case and check your graphics card too, ensure the fans underneath it aren't brushing up against a wire or something. If the screws are quite tight mounting it to the PC case, then just loosen them a tiny bit. When the PC is turned off, check the PSU (power supply unit) fans aren't full of dust or have a broken fin.