GA-EP45-UD3P PWM Fan Control

[mm67]

You have that Cougar PWM fan connected to cpu fan header and have selected PWM mode in bios ? PWM fans should never stop, when you set control to 0 % it should run at minimum speed, according to Cougar specs about 800 rpm. If fan stops then it sounds like you are using voltage mode for fan controlling.

[Ken429]

Not true in my case. The fans are connected to the 4-wire cpu header and the BIOS is set to PWM. Doesn't the 680 rpm bother you?

[mm67]

I just noticed something in previous message, you mentioned Noctua Low Noise Adapters. Are these 3-pin resistors ?

[Ken429]

They are 4-pin adapters that come with their $30 PWM fans.

[mm67]

Ok, so they probably just reduce the voltage a bit to lower operating range of their fans. I really have no idea what happens to other PWM fans when they get a reduced operating voltage but also receive PWM signal, maybe that's why your fans can stop with PWM control. Without them your fans should run at 800 rpm with 0 % control and at 1500 rpm with 100 % control. That is how all my pwm fans work.

[Ken429]

Here you go - no Noctua Noise Reducers. While I'm doing this the fans jumped from ~820 to ~1290 rpm and nothing is going on. If I go back to zero % the fans stop. If I go back to 65% the fans go back to ~1290 rpm! 65% should/was ~850 rpm. Nothing makes sense. I don't think Speedfan4.46 and my Gigabyte MB/CPU are meant get along very well. Although ET6 is slow at least it does what one would expect with the settings it is given.

profJim,
I'm afraid I'll have to join your camp, it don't work for me either.

[mm67]

I can't understand what's going on with your fans, 1758 rpm reading in your picture should be impossible for a 1500 rpm Cougar fan. RPM reading on Fan4 is what I would expect from a 1500 rpm fan running at full speed.

[Ken429]

I agree not much makes sense with Speedfan when trying to control PWM fans on this system! I'm sure it works for most people but I'm losing interest! The ~1400 rpm is the Corsair H50 pump. It's supposed to run full @ ~1400 rpm. I thought we were getting close but too many strange things happen when I let Speedfan get control. It always seems to reset and act normal after a reboot but then it starts doing strange things when the cpu heats up a few degrees. It is a great monitoring tool (for me) and I'll leave it at that. Thanks for the effort, I did learn enough to be dangerous about Speedfan but the system is cool and quiet with the Cougar fans and the Noctua Noise Reducers (Cougar fans running @ <1000 rpm's). I'm not using this machine it to break any OC records so I'll leave it alone for a few more years. Thanks again.