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the only thing that makes noise in a computer is the fan (unless you have one of those clunky old hardrives that clicks as it loads stuff)
its likely dust. If you dont clean dust out of your pc every once and a while, it will build up, screwing up chips and clogging fans (making them noisy in the process). Theres a 90% chance this is your problem. Go out to any computer shop and get a can of compressed air. Open up your case, and use it to blow dust off your chips/fans. I do this every month or so. This also helps keep heat down and makes your pc last longer because all the chips arent coated in crap (bad for em!).
The only other thing it could be is your fan vibrating up against something, or your fan blade is a bit screwed and the blades scrape along the side of the fan. If your half decent with a screwdriver, you can screw off the little fan and put some thin rubber washers between it and the card. If you think the blade is scraping the side, just try nudging it back into position.
Just dont blame me if you screw something up 
Oh, and do NOT put any oil of any kind on your fan! All computer fans are ball bearings, oil wont help it very much, and it probably will screw up your card.
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