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Can someone make sense of PWM settings for me

post #1 of 9
Thread Starter 
So I am using PWM fans for the first time and I do not understand my motherboards fan settings.

Essentially my options as my bios show a range from: .75 PWM Value / °C to 2.50 PWM Value / °C
Now seeing as I am used to % or RPM's I am pretty clueless to what these ratios mean. The manual does not explain this at all.

Thanks for the help
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Boomstick
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post #2 of 9
Come one guys I am curious as well, how does this setting work?
post #3 of 9
Thread Starter 
How does this have people stumped? I thought this was Gigabyte central.
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post #4 of 9
The settings are just bad. I think it's really just what the setting says it is. You take temperature in C and multiply by that factor mentioned. The result will be the PWM percentage used. So if the CPU sensor says 25c and you've set it to 1.5, it'll be 38%. At 66c for CPU it will be 99%.

I don't quite remember how it worked on ASRock, but I remember being pretty satisfied which I can't say about Gigabyte. Another somewhat serious annoyance is all case fans being tied together to the same speed (at least it's like that on Gigabyte Z77).

If you can wrap your head around Speedfan, you might want to use that. Speedfan is also very bad because of its UI, but you will be able to create a direct temperature to PWM percentage translation while pulling temperatures from different sources. You might for example let it ramp up the case fans when either CPU gets hot or GPU gets hot or the "System" sensor, with all three rules active at the same time.
post #5 of 9
Thread Starter 
Quote:
Originally Posted by deepor View Post

The settings are just bad. I think it's really just what the setting says it is. You take temperature in C and multiply by that factor mentioned. The result will be the PWM percentage used. So if the CPU sensor says 25c and you've set it to 1.5, it'll be 38%. At 66c for CPU it will be 99%.

I don't quite remember how it worked on ASRock, but I remember being pretty satisfied which I can't say about Gigabyte. Another somewhat serious annoyance is all case fans being tied together to the same speed (at least it's like that on Gigabyte Z77).

If you can wrap your head around Speedfan, you might want to use that. Speedfan is also very bad because of its UI, but you will be able to create a direct temperature to PWM percentage translation while pulling temperatures from different sources. You might for example let it ramp up the case fans when either CPU gets hot or GPU gets hot or the "System" sensor, with all three rules active at the same time.

What the heck, with setting it at 2.5 if it's 50 degrees and you could have your fans trying to run over 100%? I tried using speedfan but changing the %'s didn't really do anything.
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post #6 of 9
I never bothered to figure those out, but what deepor said makes sense. If it goes over 100%, then it will just run 100%.

The reason why I never bothered is because I use Speedfan. With UD4H you get Easytune which is pretty good after last few updates.
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post #7 of 9
If you want I can make screenshots of how I've set up Speedfan on my Z77X-D3H, but not sure if that will be useful for your board.
post #8 of 9
Thread Starter 
Quote:
Originally Posted by deepor View Post

If you want I can make screenshots of how I've set up Speedfan on my Z77X-D3H, but not sure if that will be useful for your board.

Yeah that would be nice thank you.

Does easy tune change bios settings or just apply changes such as overclocking when the software loads?
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post #9 of 9
First of all, I don't know how it's for your board, but my board can only do voltage control on the CPU_FAN header and the SYS_FAN1 header.

I have 3-pin fans everywhere and only control the CPU fan and one 140mm fan that will speed up if the graphics card heats up the case. The fans on SYS_FAN2 and SYS_FAN3 headers are running at a constant slow speed by themselves.

If I would want to control all case fans with the board, I would have to use y-cables and put them all on SYS_FAN1. For 4-pin PWM fans, the board could also control SYS_FAN2 and SYS_FAN3 according to the manual.


This is the important screenshot:



By default, Speedfan won't take over control from the board. If the signals are not on "software controlled", Speedfan will simply do nothing.

On my Z77X-D3H, it's like this:

Pwm1 = CPU fan 12v voltage control
Pwm2 = SYS_FAN headers
Pwm3 = CPU PWM fan control

With a 4-pin PWM fan on the CPU cooler, I would leave "Pwm1" on "ON/OFF" and instead take over control of "Pwm3" (see also some later screenshot). I use 3-pin fans, so I have to use Pwm1.






You can rename things in the first column. The check marks are just to make something show or not show in the main window.







The min value looks strange because it's a voltage controlled 3-pin fan and not PWM and will turn off if voltage goes below 5v or so.




The graphs again look strange because it's voltage controlled and 0% would be off instead of just low speed. The "hysteresis" can be used to reduce the amount of speed changes.
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