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Asus P8Z68-V Fan Header and Fan Control Questions - Page 2

post #11 of 34
Quote:
Originally Posted by hirolla888;15022618 
But being able to control the fans in the BIOS isn't really "software" control confused.gif

You could be right about the only 2 controllable fans showing in SpeedFan, however I don't think the 3rd is GPU because my GPU fan is set to 40% in Afterburner atm and none of those 3 readings are showing 40%.

If I can control it in BIOS, I'm pretty sure Speedfan can control them too. I cannot comment as I don't use Speedfan. Unnecessary applications like that, i never bother installing. My BIOS turns them up and down with temps, so I don't need Speedfan. wink.gif But I am pretty confident that it would work fine with Speedfan, as long as Q Fan control is enabled in BIOS.

And I have no idea what the 3rd fan is. It could just be one of the other fan headers that reports it can be controlled, but cannot. Speedfan isn't exactly the best program to tell you what is controllable and what's not....especially since its not used a whole lot by most people.

But here...I'll go ahead and download and install it, and report back if Speedfan can control CHA_FAN1 or not.
 
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post #12 of 34
Just as I thought, Speedfan doesn't work on ANY of the fan headers on my P8P67 Pro. I've got fans plugged into all of them, and not a single one is controllable via Speedfan.
 
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post #13 of 34
Thread Starter 
Huh? Many OCN members told me to use Speedfan so that I can link my GPU temps to control the speed of the fans specifically GPU. That was the setup I'm thinking all along and now it is not possible?

I'm confused frown.gif mm67 also stated in another thread that Speedfan already has support for NVIDIA GPU's.

Regarding 3-pin fans, yes they can be controlled by voltage through software as long as there is hardware in the mobo to do so. Usually, if the BIOS allows it, software also can control it. Googling this would backup my claims properly.
Edited by kevindd992002 - 9/22/11 at 1:02am
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post #14 of 34
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Bump!
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post #15 of 34
Speedfan does work for me.
I can control cpu fan if the fan is pwm and
I can control cha_fan1 which control cha_fan2 if fan are plugged on it (3 pins or 4 pins fan).
The bios is not enough for me because cha_fan can be set minimum at 60%.
You can even shutdown them with speedfan except the cpu fan.
Edited by Sevens - 9/23/11 at 2:53pm
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post #16 of 34
Thread Starter 
Quote:
Originally Posted by Sevens;15041787 
Speedfan does work for me.
I can control cpu fan if the fan is pwm and
I can control cha_fan1 which control cha_fan2 if fan are plugged on it (3 pins or 4 pins fan).
The bios is not enough for me because cha_fan can be set minimum at 60%.
You can even shutdown them with speedfan except the cpu fan.

Great. Does CHA_FAN1 work with PWM control of Speedfan for you?
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post #17 of 34
Yes it does.
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post #18 of 34
@Sevens

I found a faq from noctua's website:

Can I run Noctua fans on 4-pin PWM connectors and use my mainboard’s automatic fan controller?
You can simply connect our fan's 3-pin connector to the 4-pin PWM sockets of today's mainboards so that the fourth pin that transmits the PWM signal is left blank (due to the shape of the connector, there's no danger of reversing polarity). Some mainboards (e.g. current Gigabyte models) are capable of controlling fans not only via PWM, but also by adjusting the supplied voltage. In some cases, this may require you to change BIOS options like "Fan Control Mode" from "PWM" to "Voltage" or "Analog". Please consult your mainboard's manual in this regard. However, some mainboards use an "auto" setting by default that automatically chooses PWM or voltage based regulation according to the connected fan. Automatically controlling the fan speed may not possible on mainboards that pulse the power rather than lowering the fan voltage.

I know that ASUS motherboard has this feature (Voltage Control Mode if the fan is not PWM), but I want to make sure if it worked for you. Thanks.
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post #19 of 34
New to this, so not sure if my response matters anymore.

This info comes from Asus itself. The Asus P88Z68-V MB has 6 fan headers:
1. pwr_fan1, 3pin,
2. pwr_fan2, 3pin

3. cha_fan1, 4pin
4. cha_fan2, 3pin

5. cpu_fan, 4pin pwn
6. cpu_fan_opt, 4pin
If you plug a 3 pin fan into a 4pin header the fan works fine but it will work at full speed only and is not "controllable"
Unlike some motherboards or even past Asus boards there is no way in bios to change between pwm or voltage control of fan headers!

Now it gets tricky, of the 6 fan header only 2 are bios controllable (all can be monitored for rotational speed):
A. cha_fan1, 4pin (but tandem wired to cha_fan2, 3pin),
B. cpu_fan, 4pin pwm (but not cpu_fan_opt).

note that cha_fan1 and cha_fan2 are wired together and share the same control but are set to be individually monitored for rotational speed. Cha_fan1 takes precedence which can be complicated unless both cha_fans are identical.
note that while cha_fan1 has 4 pins it is not a pwm header: pinout (LtoR) +5V; cha fan in; cha fan pwr; gnd. This pinout is different than pwm header pinouts: (LtoR) cpu fan pwm; cpu fan in; cpu fan pwr; gnd. I have been unable to find what their alternate 4pin header is or for!

Initially not realizing all there complexity, I bought two case fans, same manuf. same model, same specs. one with a 3pin plug and one with a pwm 4pin plug. The Qfan bios control worked but cha_fan1 runs at "low" 200rpms lower than cha_fan2 and at "high" ~200rpms faster than cha_fan2. HUH? That's when I realized cha_fan1 is not a pwm fan header.

I also realize that Qfan uses pwm control for cpu_fan and voltage control for cha_fan and cha_fan2. I am confused about cpu_fan_opt, clearly asus states it is not controllable yet it does state it is a pwm header. Asus indicates that cha_fan1 & 2 share control, but do not say that about cha_fan_opt. Even the naming convention is different cha_fan and cha_fan2 vs. cpu_fan and cpu_fan_opt.

Technical: PWM header works by having the fan control circuitry in the fan (not the motherboard). A signal is produced by the motherboard but the fan reads it and interprets what to do accordingly. It is cheaper and simpler for the motherboard manufacturer. The signal is sent over the pwm pin and is always on. The signal is a current whose voltage or amperage (sorry, not sure), varies into pulses of intensity. There are two intensities hi and low (which is always present), It isn't the high and low that is the message, but the length of time the high is present. The call the high a pulse so the length (or width depending on how you look at it) of the pulse is the message. Therefore pwm means pulse width modulation. the result is an always on, finely controllable, and instantaneous signal.

Voltage control of a fan is simple. The more voltage or power a fan gets the faster it can spin. (within its specifications), The problems with this type of control are: there can be instances of no voltage and the fan stops, doesn't even register to the motherboard (bad for a cpu fan), the control is not as fine, more granular, the fan takes some time to slow down or speed up in response, and if the voltage applied exceeds your fns specs it can burn out. None of these are issues with pwm. Voltage controlled fans are much cheaper to make.

That's more than I ever wanted to know about computer fans!! whew.

My problem is, I learned all this because I like automatic. I want the motherboard to read the various temps and control the fans. I also feel the native temp monitoring should be the best and I could do without even more wires cluttering my case for probes.

But my cpu fan is a zalman cnps9700 (not the nt) and only has a 3 pin fan plug. It works wonderfully and I already owned it. At full speed it sounds like an aircraft. I have 3 case fans in, out, top in. ugh. The in and out are matched but one has a 4pin pwm plug. The top in matches nothing. Still haven't figured out how to make it all work the way I want it to. HELP!

Jake
post #20 of 34
Thread Starter 
Quote:
Originally Posted by Jakejosh View Post

New to this, so not sure if my response matters anymore.
This info comes from Asus itself. The Asus P88Z68-V MB has 6 fan headers:
1. pwr_fan1, 3pin,
2. pwr_fan2, 3pin
3. cha_fan1, 4pin
4. cha_fan2, 3pin
5. cpu_fan, 4pin pwn
6. cpu_fan_opt, 4pin
If you plug a 3 pin fan into a 4pin header the fan works fine but it will work at full speed only and is not "controllable"
Unlike some motherboards or even past Asus boards there is no way in bios to change between pwm or voltage control of fan headers!
Now it gets tricky, of the 6 fan header only 2 are bios controllable (all can be monitored for rotational speed):
A. cha_fan1, 4pin (but tandem wired to cha_fan2, 3pin),
B. cpu_fan, 4pin pwm (but not cpu_fan_opt).
note that cha_fan1 and cha_fan2 are wired together and share the same control but are set to be individually monitored for rotational speed. Cha_fan1 takes precedence which can be complicated unless both cha_fans are identical.
note that while cha_fan1 has 4 pins it is not a pwm header: pinout (LtoR) +5V; cha fan in; cha fan pwr; gnd. This pinout is different than pwm header pinouts: (LtoR) cpu fan pwm; cpu fan in; cpu fan pwr; gnd. I have been unable to find what their alternate 4pin header is or for!
Initially not realizing all there complexity, I bought two case fans, same manuf. same model, same specs. one with a 3pin plug and one with a pwm 4pin plug. The Qfan bios control worked but cha_fan1 runs at "low" 200rpms lower than cha_fan2 and at "high" ~200rpms faster than cha_fan2. HUH? That's when I realized cha_fan1 is not a pwm fan header.
I also realize that Qfan uses pwm control for cpu_fan and voltage control for cha_fan and cha_fan2. I am confused about cpu_fan_opt, clearly asus states it is not controllable yet it does state it is a pwm header. Asus indicates that cha_fan1 & 2 share control, but do not say that about cha_fan_opt. Even the naming convention is different cha_fan and cha_fan2 vs. cpu_fan and cpu_fan_opt.
Technical: PWM header works by having the fan control circuitry in the fan (not the motherboard). A signal is produced by the motherboard but the fan reads it and interprets what to do accordingly. It is cheaper and simpler for the motherboard manufacturer. The signal is sent over the pwm pin and is always on. The signal is a current whose voltage or amperage (sorry, not sure), varies into pulses of intensity. There are two intensities hi and low (which is always present), It isn't the high and low that is the message, but the length of time the high is present. The call the high a pulse so the length (or width depending on how you look at it) of the pulse is the message. Therefore pwm means pulse width modulation. the result is an always on, finely controllable, and instantaneous signal.
Voltage control of a fan is simple. The more voltage or power a fan gets the faster it can spin. (within its specifications), The problems with this type of control are: there can be instances of no voltage and the fan stops, doesn't even register to the motherboard (bad for a cpu fan), the control is not as fine, more granular, the fan takes some time to slow down or speed up in response, and if the voltage applied exceeds your fns specs it can burn out. None of these are issues with pwm. Voltage controlled fans are much cheaper to make.
That's more than I ever wanted to know about computer fans!! whew.
My problem is, I learned all this because I like automatic. I want the motherboard to read the various temps and control the fans. I also feel the native temp monitoring should be the best and I could do without even more wires cluttering my case for probes.
But my cpu fan is a zalman cnps9700 (not the nt) and only has a 3 pin fan plug. It works wonderfully and I already owned it. At full speed it sounds like an aircraft. I have 3 case fans in, out, top in. ugh. The in and out are matched but one has a 4pin pwm plug. The top in matches nothing. Still haven't figured out how to make it all work the way I want it to. HELP!
Jake

Just to clarify some things about your post.

The 4th pin (PWM pin) of both the CPU_FAN and CPU_FAN_OPT headers are shorted together and so if you use the same make of fans (as with using a Silver Arrow heatsink with two fans) they will scale at equal amounts of RPM.

What you explained about technical PWM is simply called "DUTY CYCLE". The motherboard sends duty cycle information to the fan in order to vary its speed. This is more power efficient unlike voltage control.
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