Take the 2-minute tour ×  I just finished building my custom PC,
and I have two 80mm fans that have molex connectors, but not the
three pin cables that connect to the motherboard (mine is a MSI
H55M-E33). So, I just connect the fans directly to the PSU, and
that works fine except that when I put the computer to sleep,
the case fans continue to spin. I do have 2 fan ports on my
motherboard, but I was wondering if there was a setting in BIOS
or something that could shut the fans off even if they are
connected to the PSU directly, or if I should just buy a cable
to connect the fans to the motherboard.   share|improve this
question 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 Aug 18 '10 a