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Reducing 3pin fan speed on Asus P8Z68

post #1 of 7
Thread Starter 
Hi,

It's really hot here lately so I decided to add a second 120mm fan to my Hyper 212. The problem is it's running at 100% constantly and it's a little loud. I've read you can't control the speed of a 3pin without a fan controller, is there no way around this?

Currently it's connected to pwr_fan1 however I've put it in cha_fan1 too and not found a way to change the speed. I have looked in the BIOS but I'm not entirely sure what I should be changing, there didn't seem to be many options that had any effect on the speed.

I know it doesn't need to be at 100%, I'd like to put it down to 70%-ish if possible.

Thanks
Edited by Narzal - 7/6/13 at 5:11am
post #2 of 7
Quote:
Originally Posted by Narzal View Post

Hi,

It's really hot here lately so I decided to add a second 120mm fan to my Hyper 212. The problem is it's running at 100% constantly and it's a little loud. I've read you can't control the speed of a 3pin without a fan controller, is there no way around this?

Currently it's connected to pwr_fan1 however I've put it in cha_fan1 too and not found a way to change the speed. I have looked in the BIOS but I'm not entirely sure what I should be changing, there didn't seem to be many options that had any effect on the speed.

Thanks

That board only has one CPU fan header, if you want to run a push/pull then you should use a 3-pin "Y-Splitter" so that both fans can be controlled via the CPU header. This way when you set the fan speed in the BIOS, both fans on your cooler will ramp up and slow down at the same time based on CPU temps.

Anyway, I'm not sure PWR fan runs at anything other than 100% but if you plug the fan into a chassis header then go into the BIOS and under MONITOR you will see the fan speeds below the temps. Turn on Q-Fan control and either set manually or select a profile. That will allow you to slow the fan down for now, but it's not going to be the greatest setup unless you connect both fans to the CPU header.
post #3 of 7
Thread Starter 
Oh I didn't think about that. I am using push/pull, I didn't think to connect them.

Is it difficult to do? I've never used a Y-Splitter before. Does it matter that one fan is 3pin and the other is 4pin?
Edited by Narzal - 7/6/13 at 5:24am
post #4 of 7
Quote:
Originally Posted by Narzal View Post

Oh I didn't think about that. I am using push/pull, I didn't think to connect them.

Is it difficult to do? I've never used a Y-Splitter before. Does it matter that one fan is 3pin and the other is 4pin?

Yes, ideally you should be using identical fans, especially if they're both connected to the same CPU cooler - different fans spin at different RPM's for the most part and they also have varying pressure and CFM ratings... Meaning that controlling the fans in a sensible manner is nearly impossible with mismatched fans. Also, sometimes you can cause a vacuum or turbulence between the fans inside of your CPU cooler which could actually lead to worse cooling (in some instances) than if you were only running one fan.

Buy a 4-pin PWM y-splitter and plug it into the CPU header and fans, very easy. Your best bet a matching PWM fan just like the one that came with the cooler and let the MOBO control both the fan speeds from the BIOS.
post #5 of 7
Here is a link to what should be a matching fan to the one on your cooler, assuming you have the 212+ and not the EVO thumb.gif

Blade Master 120MM

PWM Y-Splitter
post #6 of 7
Thread Starter 
Thanks a lot smile.gif

This is the second fan I'm using right now, the first one came with it - Cooler Master 12cm SickleFlow

So if I just buy another Blade Master it will run exactly as the first fan and not on 100%?
Edited by Narzal - 7/6/13 at 6:21am
post #7 of 7
Use the SickleFlow as a chassis fan and replace it with a Blade Master for better performance and fan control on the CPU cooler thumb.gif

Yes it will run the same as the other fan (both fans are the same) just so long as you plug them both into the PWM Y-splitter and then plug the splitter right into the CPU header. Easy fix smile.gif
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