Control 3 pin cpu fan on Z77A-G45

hi, i have a Z77A-G45 motherboard and a cpu fan with 3 pin only (no 4 pin PWM),
the cpu fan is spinning at a high rpm all the time and no matter if its idle or cpu is extremely hot,
i couldn't get it to change using the bios hardware monitor's "CPU smart fan target",
nor with msi control center on windows.
i believe this is because the motherboard needs to be told to change voltage instead of pwm mode (this solved a similar problem on a gigabyte board),
how do i change the cpu speed from pwm to voltage mode?

Quote
is there a way to somehow "upgrade" my fan to have 4 pin PWM?
Buying a different (PWM) fan...

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Hello MSI gurus,
I've replaced the MB in an older HP media center with the MSI 785GTM-E45 running BIOS V8.8 out of the box.
CPU = Athlon 64 X2 4200+
My problem is the stock CPU fan has a 3 pin connection (voltage controlled) and is running at 100% speed all the time. From what I've read on the forums there are a number of people that have this issue (with other MBs with 4 pin cpu fan headers) and don't want to switch to a 4 pin CPU fan (PWM controlled). I am in the same situation.
I am hoping that there is a BIOS for this board that has an option to switch to or enable voltage control on the CPU fan header.
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I have tried the 3rd party freeware SpeedFan and if had no effect on the fan speed.
I am not able to check if I have the latest BIOS or even find changelogs for existing BIOS verions because MSI seems to only direct BIOS downloads for this product to the Live update application. I have installed the live update program and it indicated V8.8 was the most recent veriosn of the BIOS for this board, although I have seen posts indicating the Live Update application is not to be trusted.
Dual core center, SpeedFan, and Live Update have all now been uninstalled.
I know the fan I'm using will change speed because I can connect a 3 pin fan controller and manually dial down the speed.
I know the BIOS can read the fan speed becase it correctly shows the RPM changes when I use the hardware fan controller.
Can anyone direct me to a BIOS version for this board (or some secret keystroke) that enables automated 3 pin voltage control on the CPU fan header?
Thanks in advance for your time.

For those who are interested I received the following answer from MSI technical support. Personally I find this to be a flaw in this board's design. I chose this MB to replace a dead MB in a HP media center for a friend. If I was buying this board for myself I likely would be using it as a HTPC because of the mATX form factor, HDMI on board, and backward compatibility for CPUs. However, due to the added cost of purchasing a new heat sink and fan I would be RMAing if I had bought it for myself. Considering many of the top performing after market coolers still come with a 3 pin fan it was a poor decision for MSI to not include support for automatic speed control of a 3 pin voltage controlled fan.
Quote
Dear Sir/Madam,
Thanks for contacting msi technical support team!
We are sorry that because of the circuit designs,we could not add cpu smart function for 3 pin's connector fan in the BIOS. The difference between 3pins and 4pins is that the second has a temperature controller but the first does not.We would suggest you utilize a 4-pin CPU Fan in order to control the CPU Fan speed.
Sorry for any inconvenience caused you!
Best regards,
MSI Technical Support Team

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Quote
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Quote from: badboy2k on 09-June-12, 02:22:01
of corse it needs a 4th pin! cpu fan headers are PWM so they run by square wave ouputs, the 4 lines are (intel fan header) pin: 1 - ground (black cable), 2 - +12V(DC) (yellow cable) , 3 - sensor (green cable) , 4 - control (blue cable)! (AMD fan header pin: 1 - ground (black cable), 2 - +12V(DC) (red cable) , 3 - sensor (yellow cable) , 4 - control (blue cable))
a 3pin fan header will run at full speed all the time as it has no control line pin 4(blue cable) that varys the speed of the fan hense it runs at maximum voltage all the time! 3 pin headers have only the ground - +12V(DC) - sensor with no control line!
But the sys fan one can be controlled though even with just 3 pin. I don't think that because it's 3 pin makes it uncontrollable. From my system i do learn that if 3 pin fan is used on 4 pin connector, no control will be given. But it's a different matter on 3 pin connector.

MSI H97 PC Mate CPU Fan RPM Control Cruve Question

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Project "Bad Wolf"
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor
CPU Cooler: Cooler Master Hyper T4 70.0 CFM Rifle Bearing CPU Cooler
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Case Fan: Cooler Master R4-L2R-20AC-GP 69.0 CFM 120mm Fan
Case Fan: Cooler Master R4-L2R-20AC-GP 69.0 CFM 120mm Fan
As you can see within my build list am getting Cooler Master R4-L2R-20AC-GP 120mm fans for my case (For short I'll call them R4 fans) and I would like to replace the stock fan from my Hyper T4 with an R4, because they are much quieter than the stock fan and have nearly the same airflow and since I'm getting a side window case it'd be nice to have an LED lit fan in the middle of my case
However the R4's are 3 pin, not 4 pin so they don't have PWM control. Is there a way to set up the H97 PC Mate to control a 3 pin fan in it's 4 pin cpu header?
I talk to MSI over the phone the guy said that it should be able to control the 3 pin fan through the cpu header via controlling the voltage. He said to look it up online to see if I could find how to do it, and to download the user manual and look through it, but I couldn't find anything on how to set up the BIOS to do that.
If I can't I'm not even going to bother to buy a third fan.
Ty KB_TheDireWolf

Hi
CPU fan headers are only able to control PWM fans(4 pins). If you lut 3 pin fan into it, it will run 100% possible speed.
SysFan headers can control 3 pinned fans by voltage increase/decrease, between 50-100%. And PWM fans of course too will work.
Maybe a fan splitter, or an actual fan controller would do? I have a controller myself for all 6 fans

Z77 mpower cpu fan header "control" no longer working

CPU fan header now only works with 3 pin fans, 4 pin fans turn off when placed on header, do not turn on. I had been running a hub off of that port to a switch 8 port fan hub controlling all case fans and a pump. cable to header only had sensor and control, power was through molex, pump which was master only had same. I had hot swapping on, had added a HDD reported bad by raid in another tower in a hotswap drive tray (hot swap on in bios) was going to check it out in seatools. tower crashed on add. rebooted, when running seatools noticed temps way out of line 70-90c normal temps even under load 60c or less. noticed tower was quite, noticed no fans turning. booted to BIOS checked reported no RPM fans not spinning in health changed options, did not help thought hub may have died. powered down unplugged and plugged pump into cpu header. power back up fans running, but still high temps cpu header shows 0 rpm. shut down move pump to sysfan 1, reboot powers up pump on temps good. pump running at 100% speed had never seen it running like that on sysfan 1 even when told to. reboot try 4 pin fan in cpu tries to spin for jet a sec then nothing. reboot try 3 pin, fan powers up spins shows in pc health. reset to default, tried 4 pin no good, switched to older bios, rebooted no good, reset cmos no good…. any ideas forum wizards? I would really like to regain control so i can throttle fans/pump.
note bad HDD was pulled before swapping headers….
MB bios 17.6 & 17.12
win 7 ultimate
i3770k
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Quote from: hansrotec on 22-July-14, 17:49:22
1) I find it strange it does not effect the other 4 pin headers do they just not use the control line despite it being there?
2) i do find it odd that prior to this running the pump directly on sysfan2 i could never get it to go to 100% only 50%, since this happened it stays at 100% on sysfan2
1) CPU_Fan has its own circuit.
http://www.swiftech.com/8-WayPWMsplitter.aspx
We generally recommend to use the “CPU_Fan” connector of the motherboard,because most motherboard manufacturers usually allow a greater range of adjustments on this particular connector.
2) probably the Voltage Contol is damaged too (if they get the max voltage (12V), they stay at 100%).

Control 3 pin cpu fan on Z77A-G45

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