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What do you have for your CPU pwm fan on your custom watercooled system?

post #1 of 7
Thread Starter 
I was curious what people have as their active CPU fan on their watercooled build.

I recently finished building my first watercooled system, and I'm having trouble using that PWM slot. Of course if I don't use it, my Rampage IV extreme doesn't like it, and I imagine not many motherboards would.

I really have no need for it, and when I plug a random 3 pin case fan there, it runs at full speed(which is loud); no matter how much I tweak with the settings. I imagine this is because it is a 3pin fan compared to a 4 pin pwm fan. What I'll end up doing is converting the d5 pump that I have to a 4 pin module and running that as the cpu fan. However I like the 'feel' of being able to control my pump along with my fan controllers.
post #2 of 7
Generally, the fans on CPU headers can only be controlled by PWM, even if the other fan ports allow speed control on 3 pin.
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post #3 of 7
just turn off the monitoring for it.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Stevesack View Post

just turn off the monitoring for it.

I'll give this a try. I did see an area where you can turn off monitoring I just wasn't aware that it would affect the CPU fan error on bios. Thanks.
post #5 of 7
Thread Starter 
Quote:
Originally Posted by losttsol View Post

Generally, the fans on CPU headers can only be controlled by PWM, even if the other fan ports allow speed control on 3 pin.

Yes, I am slowly learning about the very fine details of computer building. I wanted to avoid too much wiring and cabling all together, but hopefully turning off the monitoring will remove the bios error for me when I don't have anything on the header. The biggest problem for me is just the sound of the fan on full speed.

Another option I might try to travel is using a limiter cables provided by corsair in their SP fans and using those on the NXZT 810 Switch fans that came with the case.
post #6 of 7
I would just disable the option in your BIOS, thats what I did when I first put my loop together. I was getting that error about no CPU fan lol

But I later learned to come to love the PWM function. Now I have 6 PWM fans and 2 PWM pumps on different supplies, with different profiles. So much win with PWM.

Another way to get around that without worrying about too much wire clutter is to run a fan's signal wire to the CPU fan header. That may stop the error from coming up and you wont have to worry about a full blast fan running the whole time. Or just get a nice quiet 500-1000 RPM fan to hook up to it and your set lol
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post #7 of 7
i am using a rheosmart 6 fan controller, it takes the pwm signal from your cpu header and outputs it to 3 pin voltage control across 6 30watt fan headers

http://www.amazon.com/Sunbeamtech-PL-RS-6-Rheosmart-Fan-Controller/dp/B004LKZESI

then plot a custom temp/fan % graph using speed fan and let it automatically adjust the fan speed



works like a charm
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