Originally posted by Ruined
Unfortunately the annoying whine in 2D is normal for the FX5800 series. There is nothing you can do about it. On the other hand, the FX5900 cards without turbines (i.e. MSI FX5900-TD128) are virtually inaudible over your cpu fan.
...err, that doesn't make any sense as the HSF on his FX5800 is nearly identical to the 5900...
If you have actually stopped the fan with your finger (excellent investigative proceedure there-kudos) and the noise persists, then perhaps you have the (in)famous nV3x 'transistor noise'. Read more about it :HERE