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GIGABYTE Z77X Owners/Discussion/Information/Support Thread and Club (UD5H, UD3H, D3H, and ALL) - Page 421

post #4201 of 6656
Although not described well in manual, Sys_Fan1 can control pwm or voltage. Do a search on system fan control and you will get a full explanation.
post #4202 of 6656
Well the CPU_Fan header also does voltage or pwm.
CPU_Fan
pin1: GND
pin2: +12V/Speed control
pin3: Sense
pin4: Speed control

SYS_Fan1
pin1: GND
pin2: +12V/Speed control
pin3: Sense
pin4: VCC

So what the difference?
post #4203 of 6656
Quote:
Originally Posted by barkeater View Post

Although not described well in manual, Sys_Fan1 can control pwm or voltage. Do a search on system fan control and you will get a full explanation.

How did you verify that pin 4 of Sys_fan1 header actually outputs PWM signal, with an oscilloscope ?
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post #4204 of 6656
It has been confirmed by other users many months ago on this thread
post #4205 of 6656
I control my mcp35x2 off of the system header. It works fine, I just wish that there were more options in bios.
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My System
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i5 3570k Gigabyte Z77X-UD5H MSI TF3 7950 Tri-fire Samsung 30nm 4x4GB 
Hard DriveOSMonitorKeyboard
Intel 320 160GB and a few samsung platters Windows7 x64 Catleap Q270 Rosewill mechanical 
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post #4206 of 6656
Quote:
Originally Posted by BababooeyHTJ View Post

I control my mcp35x2 off of the system header. It works fine, I just wish that there were more options in bios.

From Sys_fan1 header ? Headers 2 and 3 work just fine with PWM but header 1 on my board only does voltage control.
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post #4207 of 6656
My Cougar Vortex 120mm PWM fan will exhibit this high pitch noise when using PWM controls at low speeds, this happens when i used it in Sys_fan2/3 or CPU_Fan (sys_fan2 makes it whine louder for some reason). Now when i used Sys_fan1 there is no longer any high pitch whine or clicks.

I'm also thinking Sys_fan1 also only does voltage control.
post #4208 of 6656
Quote:
Originally Posted by mm67 View Post

From Sys_fan1 header ? Headers 2 and 3 work just fine with PWM but header 1 on my board only does voltage control.

http://www.overclock.net/t/1239993/official-gigabyte-z77x-owners-discussion-information-support-thread-and-club-ud5h-ud3h-d3h-and-all/3840#post_18345833
post #4209 of 6656

Your linked post only says that Sys_fan headers 1,2 and 3 are controlled by PWM2 control of Speedfan, it says nothing about how each header works. PWM2 is just a label in Speedfan, it doesn't mean that all headers behind it use PWM control.
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post #4210 of 6656
what's your point. are you saying that sys_fan1 will not control a pwm fan? That would be contrary to the manual and what many others have reported. maybe your board works different
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