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setting fan speeds on a asus p8z77-v le plus

post #1 of 7
Thread Starter 

i just installed a swiftech h220 with the pump on 'channel 2'. it starts at about 900 rpm, then after a few seconds it goes up to 2500-2700 rpm then drops in a second. i want to set the pump at a steady 50% or so, but the limitations of the mobo wont let  me. it have a set minimum and max rpm limit compared to the cpu temp and i dont want that. is there any way to set all the fans connected to various rpm's without having to worry about the temps?

 

http://www.youtube.com/watch?v=sesNnIB6rZY

 

^ this is what's happening

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post #2 of 7
Quote:
Originally Posted by Radmanhs View Post

i just installed a swiftech h220 with the pump on 'channel 2'. it starts at about 900 rpm, then after a few seconds it goes up to 2500-2700 rpm then drops in a second. i want to set the pump at a steady 50% or so, but the limitations of the mobo wont let  me. it have a set minimum and max rpm limit compared to the cpu temp and i dont want that. is there any way to set all the fans connected to various rpm's without having to worry about the temps?

http://www.youtube.com/watch?v=sesNnIB6rZY

^ this is what's happening

Well if you don't mind setting your Waterblock Pump to 100% constantly, go into your BIOS and set the channel 2 fan control on disabled, this will leave it at 100% at all times.

If you want to further control fan speeds, you could use a program such as ASUS AI Suite II software for Fan control. (Hopefully you wont have any issues using this program) You can set custom fan profiles with this program.

Another way is using a program called SpeedFan. I'm not exactly sure how the fan speed controls work on it.
Edited by benjamen50 - 1/11/14 at 11:18pm
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post #3 of 7
Thread Starter 

well, i have tried all those and i cant set it at a rate such as 70% forever. ive been thhrough the bios probably 50 times, got my system tuned and have had the ai suite since i built my pc, even though it helps make custom curves, it still stops you in a lot of places...

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post #4 of 7
The ASUS FAN control only works reliably if you use PWM fans. That's great if you have an actual CPU PWM fan, but not so great if you have a 3-pin non-PWM pump trying to run on one off those headers. Notice the motherboard manual settings specify "duty cycle" minimums and maximums - duty cycle only applies to PWM devices, as 3-pin fans require voltage control to adjust.

If you really want to reduce your H220 pump (and I wouldn't advise doing so, unless your pump is noisy) you can set the channel fan control to disabled, and get an inline resistor module to drop the voltage to the pump. That way, you still have rotational sense capabilities to trigger an alarm or shutdown in the case of a pump failure, and can get the lower speed you desire.

Greg
post #5 of 7
Thread Starter 

what is the purpose of the duty cycles? and is there a way to set the rpm to a set number.

 

btw, the pump is pwm

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post #6 of 7
Cool, I thought the H220 had a fixed pump and PWM fans like the Corsair H100i. That's nice to know!

Duty Cycle is how PWM controls fan speeds. The motherboard turns the 4th pin on and off rapidly, which then triggers a transistor inside the fan itself to turn the motor current on and off at the same rate. Think of it as a low voltage signal (PWM) controlling a relay that turns the fan on and off quickly. The net effect is that the fan then runs at less than 100% speed.

There's no way to set the RPM to a fixed number in the BIOS, and I don't think ASUS FAN XPERT will either. You would need an external fan controller to do that.

The Corsair H100i can set fans to specific RPM (or a close approximation) by measuring the fan speed and adjusting the PWM signal to get the fans to settle at the desired RPM. Unfortunately, that feature is integrated with the H100i water block itself where the fan controller resides. The motherboard can't do it alone.

One final note on PWM. 70% PWM signal doesn't necessarily equal 70% fan speed. As fan rotational speed goes up, so does air pressure resistance - so it takes more power at higher fan speed. The ASUS FAN XPERT software has a feature that ramps the voltage slowly from 0-100% and measures rotational speed, so you can figure the RPM out at a particular PWM frequency.

Greg
Edited by hammong - 1/12/14 at 12:00am
post #7 of 7
Thread Starter 

hmmm... i set the min/max cycle to 70% with no change in the throttling. the only way to keep the pump "stable" is to set it at 100% and i want to use it at about 70%, before it begins to get noisy... you can see in the bios, the rpms go up about ~100 every second from ~900 to ~2800 rpm, then drops back down to ~900...

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Samsung 830 128gb Seagate 2TB 7200 rpm 64mb cache Seagate 1TB 7200 rpm 64mb cache Swiftech H220-x 
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Kraken G10 Zalman LQ320 (GPU) Windows 7 Pro Asus PB278Q 
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