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Phanteks PWM Hub question - Page 3

post #21 of 26
Quote:
Originally Posted by Nukemaster View Post

Are the hubs 100% the same. Some may just be like a splitter.
While their PCBs and schematics are not identical, the functionality is the same. for all.

Over and over and over and over we wee people thinking because they plug a PWM fan into a 4-pin fan header and it's speed is regulated that it is functioning on PWM. This is not true. PWM fans change speed with variable voltage on pin-2 or with PWM signal on pin-4 and fixed 12v on pin-2.

PWm fan headers supply constant 12v power on pin-2 .. same as PWM splitter with PSU power connectors do.

Phanteks fan header is not a PWM fan hub. It is a PWM controlled 3=pin variable voltage fan hub.

Here is how the wiring of a PWM fan works .. same as PWM splitter with PSU power connector. You can test a 4-pin fan header using PSU 12v power and mobo PWM signal this way to determine if the header is truly a PWM header.
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22689802

Here is another link to PWM control
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22319246

Using a Phanteks PWM controlled hub requires a true PWM signal from motherboard fan header pin-4.
post #22 of 26
Quote:
Originally Posted by ciarlatano View Post

He stated previously that he tested both on the same CPU header - one worked correctly, the other had no response to PWM changes.
Ups, I missed that. redface.gif Just try8ing to be sure. I've seen users say they are sure they have PWM signal when they didn't. I've tested a couple of "defective" hubs that were in fact functioning properly .. other than a identity-ten-tee error.
post #23 of 26
Thread Starter 
Quote:
Originally Posted by doyll View Post

Have you verified this by using the same fan header you are using on the new hub for the case hub? Not doubting you, just want to be sure.

To the best of my knowledge the only PWM fan header on your Rampage IV are the CPU fan headers like this. And this is not what the manual shows.


Asus has a known history of saying headers are PWM when they in fact do not have a PWM signal on pin-4
http://www.overclock.net/t/1401311/asus-rampage-extreme-iv-pwm-problem/0_20


Yup I know they only have 1 PWM header. The CPU-Opt runs off of the CPU header. When I first tried pwm I found this thread where RAJA says the CPU-Opt is tied to the CPU Header.

http://rog.asus.com/forum/showthread.php?44496-Rampage-IV-Black-Edition-PWM-Control

My plan is to have 1 on the CPU header and the other on CPU-Opt so they all run the same speed but the case hub will not function with 12v connected. I can see with the OC Panel that the case Hub is getting a RPM reading but the fans just run at 1570 RPM.

Also I noticed Asus Fan Xpert works with the SATA based PWM hub but doesn't work with the molex based one.
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post #24 of 26
Quote:
Originally Posted by WannaBeOCer View Post

Yup I know they only have 1 PWM header. The CPU-Opt runs off of the CPU header. When I first tried pwm I found this thread where RAJA says the CPU-Opt is tied to the CPU Header.

http://rog.asus.com/forum/showthread.php?44496-Rampage-IV-Black-Edition-PWM-Control

My plan is to have 1 on the CPU header and the other on CPU-Opt so they all run the same speed but the case hub will not function with 12v connected. I can see with the OC Panel that the case Hub is getting a RPM reading but the fans just run at 1570 RPM.

Also I noticed Asus Fan Xpert works with the SATA based PWM hub but doesn't work with the molex based one.
So "1" is functioning on CPU-fan, but "the other" is not function on CPU-Opt, correct?

Sorry to keep beating a dead horse, but you have tried "the other" hub on CPU header?
post #25 of 26
Thread Starter 
Quote:
Originally Posted by doyll View Post

So "1" is functioning on CPU-fan, but "the other" is not function on CPU-Opt, correct?

Sorry to keep beating a dead horse, but you have tried "the other" hub on CPU header?

Yes I said that in my other post. I tried both separately in CPU Header.

My main goal was to use one in CPU Header and one in CPU-Opt but I noticed the molex hub doesn't work like it should.
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post #26 of 26
Quote:
Originally Posted by WannaBeOCer View Post

Yes I said that in my other post. I tried both separately in CPU Header.

My main goal was to use one in CPU Header and one in CPU-Opt but I noticed the molex hub doesn't work like it should.
Drop Phanteks an email. They have good customer support.

You could use a splitter on CPU header if needed .. in case the CPU-Opt isn't working like it should.
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