Re: Palit GTX 570
Try reversing your side fans to exhaust all of the warm air that the video card is producing.
If your GPU is producing a lot of heat, then you want to exhaust that heat, not intake air in and spread the heat around.
I would check the heatsink and fan on the video card. Make sure that the heatsink is on evenly and the screws, or whatever attachment system used is secured.
Ansure that all of your fans, and the interior of your case doesn't have excess dust. You can expect a little dust on the fans, but any inside the case should be removed.
If nothing else works, I would contact the ebay seller and ask for a refund.
Build to be updated, a reminder to myself.