Gaborone
Quoted from Markharris2000:Years ago, the PC builders were making kits to reduce their 12V fans to 7v to reduce noise. FRYS here in California used to sell the cable. It was a simple 1/2Watt resistor. If I remember my math, "R=E/I" where the voltage you want to drop is 5volts, and the fan spec says it consumes .13Amps. So doing that math yields 38ohms, which is very close to a stock 39ohm part. Try putting a 39ohm, 1/2watt carbon resistor in the red power line to the existing cable....
This is true of older two wire fans (I have no idea what fans are used in these supplies as I haven't looked) BUT modern fans have a feedback sensor and unless the motor is turning at the correct speed they often won't operate. Some might but it couldn't be guaranteed.
