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post #11 of 42
I've been reading about PWM. I do not know what it is or what it stands for. Anyone care to explain?
post #12 of 42
Thread Starter 
Quote:
Originally Posted by x Yoko View Post

I wouldn't think that delay would be anything you could change whether the control was automatic or manual. The time it takes for RPM adjustment between PWM, RPM control, and volt reduction is probably fractionally different. I don't think you're going to see any major cooling ability differences (assuming you find PWM fans that match specs of regular fans you would use) between the types of fan control.

The fans will respond almost instantly to the CPU temp...in plain eglish will the loop its self respond quick enough to merit spending the extra money on the fans and harness over just leaving the fans at a perset RPM and never changing them, If I don't do PWM I'll be treating the fans in a "set and forget" manner.
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post #13 of 42
Thread Starter 
Quote:
Originally Posted by Captivate View Post

I've been reading about PWM. I do not know what it is or what it stands for. Anyone care to explain?

Pulse Width Modulation.
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post #14 of 42
Quote:
Originally Posted by KhaoticKomputing View Post

How dose the pump work on PWM function if I can ask, dose the pump speed changing based on load actually help temps?

I don't actually have mine increase ever. I just set them to '20%' in Speedfan and leave them at that speed. Keeps them silent. But you can have Speedfan control the pumps based on CPU and/or GPU temperatures.
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post #15 of 42
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Originally Posted by lowfat View Post

I don't actually have mine increase ever. I just set them to '20%' in Speedfan and leave them at that speed. Keeps them silent. But you can have Speedfan control the pumps based on CPU and/or GPU temperatures.

Sweet, thanks. I might have to get plug's big enough to power pumps. I was going to get the MCP 35X regaurdless of how I opt to use it. It seems to be one of the best pumps around.
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post #16 of 42

I would advise staying away from running your fans as a PWM using as PWM modulation.  I would control the the fans using the PWM fan header and using a fan controller which translates the PWM signal to a varied voltage based on the PWM signal it receives.  

 

There are a few reasons for this, 1) You're not limited to a particular fan. 2) PWM fan modulation has an inherent whining noise due to pulse modulation, it does not vary voltage.  If you're not sure what I mean, YouTube it and look for PWM modulation fans tested. 3) PWM fans are typically more expensive.


Good luck!

post #17 of 42
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Quote:
Originally Posted by betatester1 View Post

I would advise staying away from running your fans as a PWM using as PWM modulation.  I would control the the fans using the PWM fan header and using a fan controller which translates the PWM signal to a varied voltage based on the PWM signal it receives.  

There are a few reasons for this, 1) You're not limited to a particular fan. 2) PWM fan modulation has an inherent whining noise due to pulse modulation, it does not vary voltage.  If you're not sure what I mean, YouTube it and look for PWM modulation fans tested. 3) PWM fans are typically more expensive.


Good luck!

I have a rheosmart6, So I could do it that way.. would having the fan speed based off of temp be worth it? regardless of the method/implementation? Thanks for you knowledge.
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post #18 of 42
If you have the rheosmart6, I say you should use that. You can selectively choose which channels will be controlled by the PWM, so not all of them have to be controlled by it.

IMO I think the hardest thing would be setting the PWM to scale properly with CPU core temperature. You will have to run your system at full speed to find the max CPU temperature. Then, you can actually set a guideline how much to scale up with CPU temperature. I'm not sure if there's a function where your motherboard can adjust PWM based on GPU temperature.
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post #19 of 42

The rheosmart 6 is a great controller and will function as Tsumi has mentioned. That is what I use.  You can build a custom one if you like too...there are a few tutorials out there if you're not sure how to do this.  The least expensive method though is using a preconfigured unit as you have.

 

The rheosmart is controlled from one PWM header.  If your GPU has a PWM control from it, you can use that to control the rheosmart.  Most GPU's I believe are voltage controlled so you'll use your PWM port from the CPU header.  If you use an ASUS board, they have FAN Xpert which works rather welll.  You'll have to find via trial and error how you want your graph to look which controls the PWM signal.  It's not too hard to set, just run a few stress tests and adjust the graphs as needed. 

 

Most of the time, unless I'm gaming, my fans actually run between 550rpm to 750rpm (I have 8 fans within my setup).  It's dead quiet when they are turned down low like this.  My CPU temp runs mostly around 20C and the GPU around 27C.  I haven't overclocked the computer yet which is why the temps are that low.

post #20 of 42
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Quote:
Originally Posted by Tsumi View Post

If you have the rheosmart6, I say you should use that. You can selectively choose which channels will be controlled by the PWM, so not all of them have to be controlled by it.
IMO I think the hardest thing would be setting the PWM to scale properly with CPU core temperature. You will have to run your system at full speed to find the max CPU temperature. Then, you can actually set a guideline how much to scale up with CPU temperature. I'm not sure if there's a function where your motherboard can adjust PWM based on GPU temperature.
Quote:
Originally Posted by betatester1 View Post

The rheosmart 6 is a great controller and will function as Tsumi has mentioned. That is what I use.  You can build a custom one if you like too...there are a few tutorials out there if you're not sure how to do this.  The least expensive method though is using a preconfigured unit as you have.

The rheosmart is controlled from one PWM header.  If your GPU has a PWM control from it, you can use that to control the rheosmart.  Most GPU's I believe are voltage controlled so you'll use your PWM port from the CPU header.  If you use an ASUS board, they have FAN Xpert which works rather welll.  You'll have to find via trial and error how you want your graph to look which controls the PWM signal.  It's not too hard to set, just run a few stress tests and adjust the graphs as needed. 

Most of the time, unless I'm gaming, my fans actually run between 550rpm to 750rpm (I have 8 fans within my setup).  It's dead quiet when they are turned down low like this.  My CPU temp runs mostly around 20C and the GPU around 27C.  I haven't overclocked the computer yet which is why the temps are that low.

Yea, but regaurdless of how it is done, is it worth it?If I had to I could buy another Rheosmart and use the VGA to PWM cable to get a PWM lead to get the GPU loop to scale, Setting the PWM fan profile's for the loop should be the same as setting them up for air, easy to do. But is it worth it lol.

EDIT: if its not worth it, I would just a normal fan controller with a RPM display set and forget. I could reuse the Rheosmart in a few other PC's I have kicking around if I dont use it on my sig rig.
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