Any suggestion on this annoyance?

I have a GB 965P-S3 mainboard, 7950 gx2 VGA on a dual boot system
(Vista/XP).

Anyway, what happens is when the PC is brought out of sleep mode, the VGA
fan runs at full speed.
This is quite noisy and the only way to get it to return to it's normal
speed-variable mode is to reboot the PC.

Not a huge issue, but if anyone has any ideas it would be much appreciated.

Cheers.