I'm going to be nice and not hate on the bandanna *cough*.. but..If you blood throw it up.
My 8800 Ultra under load was screwing with my soundcard, you could hear interference pretty bad.
I got tired of it.
I took one of those plastic clamshell hard drive containers, cut it in half, cut off the edges and I just happen to own some aluminum tape...
And you know what? Totally works. No more noise.