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Trouble with PWM control on chassis fan headers w/ PWM splitter? - Page 3

post #21 of 53
Quote:
Originally Posted by Gavush View Post

here's how far I've gotten:



apparently Carter is the gate keeper.

That being very kind but accurate.
post #22 of 53
Thread Starter 
No response from who ever it was that Carter forwarded my issue to. Sent Mr Carter an E-mail on Friday asking him what the deal was, no response. Nearing one month with no resolution. Good thing it's not anything "life threatening"
post #23 of 53
Thread Starter 
Turns out I had a reply on the message center on ASUS's website.
Quote:
Originally Posted by carter 
So sorry for the delay.
After checking with the relative department, they mentioned that the chassis fans are all DC mode.

Best Regard
Carter

My reply:
Carter, I have not seen any new information in my yahoo mail e-mail, I just sent another message about not having a reply. I came to Asus site and found technical message center and saw saw your reply from 2/16, so you can ignore the e-mail I just sent a few minutes ago. I guess the message got sent to spam folder.

PWM chassis fan control is a feature of the M5A97 R2.0 motherboard that is described in detail in the owners manual. I bought the R2.0 because it is supposed to have PWM chassis fan control. I did not buy the EVO R2.0 because it does not.

Are you telling me that this product does not have this feature even though it is in the manual and on the connector diagram? This is information supplied by ASUS about it's products. I used this information to choose the product that would complete the job.

If The M5A97 R2.0 motherboard does not PWM chassis fan control, do ANY of the M5A97 motherboards do this? Do any of your motherboards do this? Which ones?

I'm not happy that I bought a product for a feature ASUS said it has, and now find out it does not have this feature. If this is normal how are people to trust the information about any ASUS product?
post #24 of 53
I would escalate this to someone at a higher level than "gate keeper". Send Carter another email Quoting whatever sources you have showing the PWM listings for Asus M5A97 R2.0 saying you have reconsidered and are reporting them for false advertising because what they have published about the Asus M5A97 R2.0 having PWM sockets and his telling you they are not PWM is false advertising and you are going go to the appropriate state and/or federal agency and file a complaints. Include the quote below. Send copies of this email to all Asus email addresses, not just his with return receipt (most email clients have this feature). Also fill out their Escalation Mailbox Customer Complaint-mail form
http://www.service.asus.com/#!Escalations%20Mailbox/c1scx
Quote:
45-2-1720. False advertising.

(a) It is unlawful for any entity to make, publish, disseminate, circulate, or place before the public, or cause, directly or indirectly, to be made, published, disseminated, circulated or placed before the public, in a newspaper, magazine or other publication, or in the form of a notice, circular, pamphlet, letter or poster or over the internet or any radio or television, or in any other way, an advertisement, announcement or statement containing any assertion, representation, or statement with respect to the sale, distribution, offering for sale or advertising of any loan, refinance, insurance or any other product or service that is untrue, deceptive, misleading, or that uses the name or logo of any other lender without the express written consent of the lender whose name is used. For purposes of this section, lender means any bank, savings and loan association, savings bank, trust company, credit union, industrial loan and thrift company, mortgage company, mortgage broker, or any subsidiary or affiliate therof.
http://law.justia.com/codes/tennessee/2010/title-45/chapter-2/part-17/45-2-1720/

Go to the below link and create a case than phone them.
http://www.service.asus.com/#!consumer/csn9

Good Luck!
post #25 of 53
Thread Starter 
Quote:
Originally Posted by carter 
In this situation, if possible, can you provide some screenshots or pictures about the
documents saying that the onboard chassis fans are controlled by the PWM for a
check?
After checking, the chassis fans of all our board are controlled by the DC.

Best Regard
Carter
Quote:
Originally Posted by Me 
For the M5A97 R2.0 The manual shows the CHA fan connections as having
PWM on page 1-21 section 1.2.9 - Also on page 3-23 section 3.6.5 talks
about the chassis Q-fan control and the duty cycle control of the fans. Duty cycle is a
term used to describe PWM. I've attached
photos of this. The manual is on ASUS website
http://www.asus.com/Motherboard/M5A97_R20/#support_Download_30

Also
I found that the Crosshair V Formula motherboard shows to have PWM
chassis fans in the diagram on page 2-23 section 5. and also states the
chassis fans are controlled by duty cycle on page
3-31.
Quote:
Originally Posted by carter 
According to the pictures you attached, you should refer to the PWM pins, after checkings with the relative departent, even with this pin connected, the chassis fans are connected by the DC, but the speed of the fans can still be controlled.
Quote:
Originally Posted by me 
Yes you can still control them. By DC. Not by PWM. This is the problem. information shows PWM pins, information says it's duty cycle, but the pwm pins do nothing, and there is no duty cycle. It is just variable voltage on chassis fan power pin.

"but there's a hole in the bucket, dear Liza, dear Liza...."
*face-palm*
post #26 of 53
I suggest you quit discussing this with the "gate keeper". Tell him you are tired of discussing it with him and want to deal direct with a tech rather than using him as the middle man.

That last exchange goes nowhere.

Bottom line is your Asus M5A97 R2.0 is not doing what Asus says it is supposed to do.

If you haven't already done it tell the "gate keeper" and everyone else that their time to resolve this is running out and you are in the process of to filing formal complaints with the appropriate authorities, as I said above.

If you have a thread going on their forum post it there too.

If you don't stand up to them they will walk all over you. smile.gif
post #27 of 53
My board is the Asus P8Z77-V LX that comes with 1 x CPU Fan 4-pin, 2 x CHA Fan 4-pin and 1 PWR Fan 3-pin.
I'm also using cable splitters by Akasa:

5-way AK-CBFA03-45
2-way AK-CBFA04-15

The speed control by the 2-way splitters works in the CPU Fan and the CHA Fans.
The CHA Fans can control both 3-pin and 4-pin fans.

The speed control by the 5-way splitter works only in the CPU Fan with 4-pin fans.

I'm pretty sure that the only header that controls fans by PWM is the CPU Fan.
I did the fan speed test through the Fan Xpert.
Warning: Spoiler! (Click to show)
CPU_FAN 4-pin with CM XtraFlo 4-pin (600 rpm - 2000 rpm)


CHA_FAN1 4-pin with Cougar Vortex HDB 3-pin 1200 rpm


CHA_FAN2 4-pin with Akasa Viper 120mm 4-pin (600 rpm - 1900 rpm)

Any 4-pin or 3-pin fans hooked in the PWR Fan 3-pin run at full blast but even quieter or low rpm fans run surprisely loud.
I have fans that run quietly at max rpm while hooked in the CHA Fan or even hooked through the psu molex but become loud in the PWR Fan.

Look another thread related to PWM splitters.
The OP's board is same as mine P8Z77-V LX.

http://www.overclock.net/t/1316121/pwm-splitter-issue
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post #28 of 53
Thread Starter 
yeah from the bit of research I just did the PWR_FAN header is always 100% (12v) and is not controlled or varied by any fan utility or bios, which would explain your results.

The PWM splitters I have get their 12v/ground from the PSU via MOLEX, so in the absence of a pwm signal they fans run at 100%. (pwm fans run at 100% when the pwm signal is 0% or 100%)

The PWM splitters work fine when daisy chained to the CPU_FAN header.

I realize that not all 4pwm CHA_FAN headers are going to be PWM - every other asus board lists the CHA_FAN 4th pin as +5v - at least one other board shows one OPT_FAN (optional fan) that's supposed to be pwm, and another board shows 3 of these optional headers with pwm specifications as well... and the Several also have an additional CPU fan header CPU_OPT that also supposedly does pwm.. an the Crosshair Formula V shows to have all PWM headers - two CPU, 3 CHA, and 3 OPT.

I guess my real issue is the board does not function as specified. I've got an email in with ASUS customer service to try to get some sort of resolution for this... though it's been about 4 days with no response.
post #29 of 53
Yeah I know that the PWR_FAN header is always 100%.

I was noticed that any quieter fan hooked in the PWR_FAN spins surprisely loud.
This fans runs quietly at 100% in the CHA Fan with speed control disabled or hooked through the psu molex.
I would say the PWR Fan should have issues about its voltage.

I tested the fan speeds with the Fan Expert.

Any fans hooked in the CPU Fan always spin above 0 rpm even at 0% fan power.

I'm pretty sure that the 4-pin CHA Fans aren't PWM control.
I have 3-pin and 4-pin fans hooked in the CHA_FAN that don't spin below 40% fan power.
So I would say that the CHA_FAN power is related to the voltage.

I also would say that this is one of the reasons that the min duty cycle in the bios is 60% for the CHA Fans.
The min duty cycle that I can adjust in the FAN Expert is 41% for the CHA Fans.
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post #30 of 53
Thread Starter 
it would be currious to see what the actual voltage is coming out of your PWR_FAN terminals, since technically the most voltage that comes out of the PSU is 12.5 or whatever, it would be difficult or it to be more than that unless there is a step-up transformer built into the mobo, which is illogical considering the fans are made to run on 12v... that is, perhaps the issue isn' that the PWR_FAN terminal voltage is too high, perhaps it's the CHA_FAN voltage is low. This is a comparison between PWR_FAN and CHA_FAN when the speed control settings are disabled, correct?

Also be sure not to assume the % within fan expert is = to duty cycle, ie for the CHA_FAN settings you might call it % of voltage where 100% is 12v and 60% is .6v - interestingly with my PWM fans the minimum CHA_FAN setting of 60% is much slower than 60% duty cycle via pwm. potentially slower than the fan's intended operational PRM.

I can also not run the "test" function to check the various fan speeds on the CHA fans within fan experpt, the button is grayed out and you can't depress it. (this function does work with the CPU fan) Also note that duty cycle is a pwm specific term
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