I bought a Radeon HD 7850 2gb Sapphire and the fans make some kind of noise at fan speed 41%-58% . After 58% The noise stops and the fan is back to normal (excluding the noise from the high rpm) . I looked at the fan and it wasn't scratching the plastic around it . I turned over the card to look at it for a minute put it back in(fans directed down like they are usually) and i stopped doing that noise. But after a while it started again. Please if you have a solution it will be helpful