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Case/CPU Fan Voltage Specs

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willow

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Nov 29, 2004
I'm researching case & cpu fans & am not clear what connections supply 12v & which supply 5v. That is, what voltage do the motherboard fan headers supply & what voltage do the psu lines supply? :confused:
 
Fan header on mobo = 12 volts, cpu header can vary voltage with fan control in bios.

PSU: yellow = 12 volts
" ": red = 5 volts
" ": blacks = ground
 
archilochus said:
Fan header on mobo = 12 volts, cpu header can vary voltage with fan control in bios.

PSU: yellow = 12 volts
" ": red = 5 volts
" ": blacks = ground
Click to expand...

Thanks the input!

Would you please clarify your psu info. The only way I'm familiar with connecting a fan to a psu lead is via a 4-pin molex connection. Those have yellow, red & black leads. :confused:
 
Case fans use 12v. The 5v is just for harddrives and optical drives.

4-pin Molex = yellow 12v power, red 5v power, both black are grounds.

3-pin fan connector = 12v power, RPM, ground (seen them use different color schemes, but only 12v power, no 5v).
 
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