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Fan

In my system cabinet the exhausts fan (120mm, 3 pin connectable by 3 color cable-red,blake,yellow), I connected directly to power supply (smps) as red to red, black to black and yellow to yellow of smps –but the fan rpm is very slow or insufficient to cool my system.
So I connected as follow to increase fan rpm
Fan 3 color cable Smps 4 color cable
^ ^
Black---------------------------black
Red-----------------------------yellow Black
Is there any wrong to my system/smps ?
4 answers Last reply Best Answer
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  1. On your three-pin connector, the yellow wire is RPM sense. It does not connect to anything from the PSU; doing so may fry something. You can get 3pin to molex adapters. Or connect black to black and red from the fan to EITHER red OR yellow from the PSU; which one you choose determines the voltage the fan will get (+5 or +12), thus how fast it will run.
  2. Onus said:
    On your three-pin connector, the yellow wire is RPM sense. It does not connect to anything from the PSU; doing so may fry something. You can get 3pin to molex adapters. Or connect black to black and red from the fan to EITHER red OR yellow from the PSU; which one you choose determines the voltage the fan will get (+5 or +12), thus how fast it will run.

    What is better & safe to do to increase my fan speed without adobting any new hardwere?
  3. Best answer
    A molex-to-3pin adapter normally passes +12v to the fan, so you'll get the highest rated speed out of it.
  4. Best answer selected by rupankur.
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