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  • If fans connect directly to the PSU, there will be no BIOS setting to disable them directly. Still, when computer is sleeping, I think (but could be wrong) that it should cut power to peripherals. On my PC, that's what happens, so no fan problems when sleeping for me. Check if you have correctly installed chipset drivers. It could be something related to them.
    – AndrejaKo
    Commented Aug 18, 2010 at 15:25
  • Take a look at this question: superuser.com/questions/82190/… It seems that if you can switch BIOS settings for sleep from S1 power state to S3 power state, fans should turn off.
    – AndrejaKo
    Commented Aug 18, 2010 at 18:06