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PWM is this normal? ASUS P8Z68 Deluxe

post #1 of 12
Thread Starter 
Both SYSFANIN AND CPUFANIN are 4-pin PWM headers and both fans are GELID Wing12PL PWM. Q-Fan control is set to Turbo in the BIOS for both.

Why is there a 500rpm difference on idle? When I stress the CPU with either Prime95 or IntelBurnTest both fans spin up to their advertised speed of 1800rpm. Do I have a faulty board or BIOS? Or is this normal?

534
Edited by kikkO - 5/5/12 at 9:31am
 
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post #2 of 12
4-pin chassis fan header is probably really using voltage control like on my Asus X58 boards. If you have a multimeter available I think that you will find a bit over 8 volts between 12V and GND pins. Between same pins on Cpu fan header there will be 12 V. You can also test by using a 3-pin fan on that chassis fan header, if it is not running at full speed when idling then header is outputting voltage control instead of PWM.
Edited by mm67 - 5/5/12 at 10:02am
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post #3 of 12
Thread Starter 
If it is outputting voltage control instead of PWM why did ASUS make that 4-pin header? Why not just leave it 3-pin? I know for sure that all my 3-pin headers on my mobo are voltage controlled, just never thought my 4-pin header would be too.

I'm going to test by plugging my pull fan into a 3-pin connector, if it's running at the same idle rpm then I'll know that 4-pin is being run off voltage control and not PWM, which is weird.
 
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post #4 of 12
I have no idea what Asus were thinking when they did that, maybe they think it looks more advanced or something smile.gif All 5 fan headers on my Rampage III Gene for example are 4-pin headers but only Cpu header outputs PWM signal, then there is 3 headers that output voltage control and the funniest one is PWR fan header which has no kind of control but yet they used a 4-pin header.
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post #5 of 12
Thread Starter 
I find this kind of weird and unfair, the P8Z68-V PRO board has 2x PWM CPU fan headers. While my board, one grade up, the Deluxe, only has 1. wth.gif and it lacks onboard graphics support.

Sometimes I think why I got the Deluxe board in the first place.
 
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post #6 of 12
I was also kind of pissed off when I figured out how the fan headers of Rampage III Gene actually work.
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post #7 of 12
Thread Starter 
Ok, now the question is, should I have a stronger pull or push? Because the CPU fan is push and the SYS fan is pull and at the moment "pull" is 500rpm faster than "push".

Should I leave it the way it is now or should I swap headers and have a stronger push?

*edit* - Or should I get a PWM Y-splitter and connect both fans to PWM?
Edited by kikkO - 5/5/12 at 11:27am
 
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post #8 of 12
PWM splitter is the smartest option in my opinion, use those chassis fan headers for case fans.
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post #9 of 12
Thread Starter 
Akasa or GELID y-splitter? I can't find information regarding the rpm wire on the GELID but the Akasa specifically states one header has the yellow (rpm) wire removed as to not confuse the motherboard rpm sensor and the Akasa looks like it has better sleeving. biggrin.gif

Oh man, I think I spent as much money on premium sleeving and fans as I did on my case. doh.gif

You wouldn't be interested in some brand new Noctua NF-F12 PWM fans by any chance would ya?
 
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post #10 of 12
Each of those Gelid fans seems to take 0.45 A and your motherboard cpu fan header can probably output only 1 A. It might be safer to use a splitter like this which takes power for fans from a separate Molex connector : http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=34_451&products_id=33363
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