I have installed a XpertVision GeForce FX5900 XT, and the fan is making a noisy rattling sound. I've heard some cards are loud, but is this card meant to sound like that?
Does you'rs have a plate like that? (i.e., the flat metal around the fan) .... check to see if that metal has any abberations .... mine had some jaggies and when I removed the plate it was quiet again
It's probably just hitting a wire inside the computer. Or it's scraping up against the side of something. Make sure the fan is not touching anything, that's the rattling noise you are hearing.