Currently Being ModeratedNov 16, 2012 5:31 AM (in response to RogueArtist)
PWM fans need logic board connection and PWM aware boards to function in the true sense.
Voltage control by the logic board and OS kexts can be accomplished using two wires for a 12v connection method.
True PWM control is not possible without a special controller, but the fans can still function as a normal fan
If you are replacing a thermally controlled fan (small green sensor), another thermally controlled fan might be better.
In the PSU, other sensors allow the PSU to control voltage to the fans, so variable speed capable fans can be used (with or without thermal sensor).
Which fan are you wanting to replace?
Currently Being ModeratedNov 17, 2012 10:21 AM (in response to japamac)
I'd like to replace the original case fan. It's a noisy sucker. I had a feeling a PWM fan wouldn't work, but it sounds like a new fan with a sensor would serve the same function. Should I search specifically for "thermally controlled fans"? Should I also be looking for something specific on the PSU side? I just replaced the original with a new ATX PSU and it works great, though I don't think it has any specific connectors for fans. Thanks for your help!
Currently Being ModeratedNov 17, 2012 11:46 PM (in response to RogueArtist)
If it helps, I had one of these in a G4 Digital Audio with many upgrades, and it worked well.
It was about the same as the stock fan, which was running fine at the time. I just wanted more airflow.
The position of its heat sensor (clockwise) was important. It needed to match the stock fan. I had neglected to do that at first, and had to reinstall it.
Currently Being ModeratedNov 18, 2012 9:10 AM (in response to Dave Hamilton)
I was actually searching last night and came across that same fan. Thanks also for the heads up on the sensor position! Thanks also Japamac for pointing me in the right direction - and a big thanks for all the great info on your website. Can't wait to (not) hear the difference!