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Weird stuff going on with my cooling

post #1 of 16
Thread Starter 
My fan config is as follows:

2 gentle typhoon AP-12s. One front one side intake. one plugged straight to motherboard and one to psu with molex adapter that has a pwm lead to the motherboard, which is plugged.
2 SP120 quiets on my h100i, plugged to the CPU block.

I was messing with speedfan and i noticed that it recognizes 3 fans. 2 intakes and the two fans in the rad as one i suppose. I tried to lower the rpm on the fans, but it seems i can only control the front intake that has the PWM lead into the motherboard with molex power, but not the one fan that is plugged straight to motherboard with 3 pin fan connector. Both ap-12 fans were bought at same time and seem identical.
Why? Could the fan be faulty?
post #2 of 16
Fans can be faulty or go bad.

If you switch the fans connectors can you control the other fans or no? That would be the first thing I test.
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Ever Evolving
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post #3 of 16
Thread Starter 
Hmm I'll try that out today and report results. Any other suggestions?
post #4 of 16
Thread Starter 
Okay, i think i solved this.
The 3 pin motherboard fan headers are not PWM? I put both of the fans to 4 pin headers, even tho the fans are 3 pin, and now i can control them fully. i thought the 3 pin headers were pwm too.

When i get my new case i'm gonna use spliters to put all my fans to the motherboard 4 pins! thumb.gif
post #5 of 16
not all of the headers on the motherboard are controllable, you'd have to look at the pinouts in your motherboard manual to see.
 
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post #6 of 16
Thread Starter 
Ah! That i didn't know, thanks for the replies, this explains a lot to me
post #7 of 16
Not a problem at all glad to hear its working.
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post #8 of 16
Quote:
Originally Posted by EPiiKK View Post

Okay, i think i solved this.
The 3 pin motherboard fan headers are not PWM? I put both of the fans to 4 pin headers, even tho the fans are 3 pin, and now i can control them fully. i thought the 3 pin headers were pwm too.

When i get my new case i'm gonna use spliters to put all my fans to the motherboard 4 pins! thumb.gif

I haven't seen a single 3-pin PWM. Can it even be made with the PWM spec? They all have 4 pins, so putting 4-pin fan onto 3-pin header doesn't report speed signal and is permapowered for high speed. Or something like that .P
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post #9 of 16
Thread Starter 
Quote:
Originally Posted by mikupoiss View Post

I haven't seen a single 3-pin PWM. Can it even be made with the PWM spec? They all have 4 pins, so putting 4-pin fan onto 3-pin header doesn't report speed signal and is permapowered for high speed. Or something like that .P

I was able to control my 3 pin GTs as well as my 4 pin nexus fans, so i dont think the fan wiring matters
post #10 of 16
Ah yes, that's why ez12a answered here. My bad. There are ways but not in terms of PWM mode.thumb.gif
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