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CPU & CPU OPT Fan Header Functionality

jezjohnson
Level 10

‎09-22-2012 02:52 PM - last edited on ‎03-06-2024 06:43 PM by Community Admin

Got a slight issue.

Using 6 fans, 2 x chassis @ 70%, 2 x opt @ 70%

Other 2 are in CPU but no matter what I set the BIOS to, they always run at 100%.

This is either as silent or manual with max 70% speed. Using BIOS 2005, anyone else had this issue? might have to get a resistor in the wire to solve it otherwise.
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7 REPLIES 7

m_oreilly
Level 7

‎09-22-2012 03:31 PM

two fans on one header? if so, how are they wired to the one header?
Asus Rampage IV GENE
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HIS HD7970
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whitey
Level 7
In response to m_oreilly

‎09-22-2012 04:27 PM

I think you need 4 pin PWM fans if you want to control them on the CPU headers.
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jezjohnson
Level 10
In response to whitey

‎09-23-2012 09:11 AM

Separate headers, 1 in CPU_FAN and the other in CPU_OPT.

Since the original post, now I don't even get a fan speed reading from CPU_FAN, still running at full pelt though.
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joesaiditstrue
Level 7
In response to whitey

‎11-28-2012 03:25 AM

whitey wrote:
I think you need 4 pin PWM fans if you want to control them on the CPU headers.


I'm pretty sure this isn't true as the PWM headers can also be ran as 3-pin headers which standard fan control, correct me if I'm wrong? I have a MVE and as far as I know I was running 3 fans off 1 header and created a fan profile in the UEFI
• CASELABS M8 • ASUS Maximus V Extreme • Intel Core i7 2600k
• 2x Reference 7970 (EKWB) • 16GB DDR3-2000 Corsair XMS3 • XSPC Raystorm
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xt-107
Level 7
In response to joesaiditstrue

‎11-28-2012 05:20 AM

if u want to control cpu fan speed u need at-least 1 pwm fan connected to cpu fan header , and cpu opt_fan header works
according to cpu fan header ( where u connected pwm fan ) , right now i am using coolermaster pwm fans because stock
H100 fans are always run @ full speed .:cool:
:cool:
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HalloweenWeed
Level 12
In response to xt-107

‎11-29-2012 01:45 AM

xt-107 wrote:
i am using coolermaster pwm fans because stock
H100 fans are always run @ full speed .:cool:

I use 4 (yes, push-pull) Excalibur fans on my H100, all on CPU fan control as they are also on two Y adapters. And the fan speed control works beautifully. I do not have the H100 feedback wire connected - it's useless IMO. FYI.
i7-3930K; Asus RIVE; G.SKILL Ripjaws Z 4x4GB DDR3 1866; MSI 7870 2GD5/OC; Crucial M4 SSD 256GB;
Corsair 1000HX; Corsair H100, 4x Excalibur 120mm PWM CPU Fan p-p, AS5; SB X-Fi Titanium Fata1ity Pro;
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(EVGA site: ) And I have a second (wife's) computer, Eve.

Overclocking is useless to me if it is not rock stable.
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SUKARA
Level 10

‎11-29-2012 12:10 AM

Perfect answer...about xt107
You must be install at-least 1 pcs PWM fan...
Otherwise,total CPU fan will be run at 100%
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