I have an old NForce 4 S939 chipset Winfast NF4SK8AA motherboard, which seems to have over the past few months developed an annoying whine from somewhere.
I initially tried changing the chipset fan as I thought this was at fault, but now i've found that it isnt the case - ive tried a different PSU, and stopping all of the fans and the noise is still there. Also tried runing the machine with both hard drives not powered up, whiney noise is still there.
Any idea what could be causing it, if it could be a particular thing enabled/disabled in the BIOS?
Long shot i know, but thanks for reading. Going to try going back to stock speeds tonight, see if that makes any difference.

I initially tried changing the chipset fan as I thought this was at fault, but now i've found that it isnt the case - ive tried a different PSU, and stopping all of the fans and the noise is still there. Also tried runing the machine with both hard drives not powered up, whiney noise is still there.
Any idea what could be causing it, if it could be a particular thing enabled/disabled in the BIOS?
Long shot i know, but thanks for reading. Going to try going back to stock speeds tonight, see if that makes any difference.