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Z97 Extreme 3 has bugged CPU FAN control
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boombastik1 View Drop Down
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    Posted: 12 Feb 2021 at 10:51pm
Nice on restart i found that the cpu peci temp freeze at the same temperature. It remembers the last temp value before initiate the restart.
We defenitally have a bug here.

Lenovo had a similar bug the solution was this:
-When we lengthened PECI reset waiting time to max 2 secs, built a trial BIOS and found the issue disappeared.
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DuranXL View Drop Down
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I meant 167rpm :) (can't edit post).
Also I have hibernation disabled (powercfg -h off) so don't use hybrid boot or hibernation.
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DuranXL View Drop Down
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Originally posted by boombastik1 boombastik1 wrote:

After you put the pc in s4 (hibernation or hybrid shutdown)in windows 10 and
then you restore the pc from hibernation the CPU temperature is stuck in the same temp.(the last temp when u put the CPU to s4)

To recreate this bug u need only the motherboard to work in uefi mode with cms on.
In pure uefi (CMS off) and in pure legacy mode this bug don?�t exist.

That is the reason that cpu fan stuck. (u need to have a pwm cpu fan also.

Hi,

Unfortunately, I also have this problem in Pure EUFI mode with CMS off :(.
CPU FAN 1 gets stuck at a certain RPM. Today my CPU overheated and got BSOD because it was stuck at 167mhz..so it's a really annoying problem.

I downloaded the A-tuning app and noticed that the CPU temperature gets stuck. In my case it was stuck at 48c, which was the same value showing in bios. This value stays at 48c even during benchmarks, HWinfo64 shows the correct temperature.

When I shutdown instead of restart or sleep, it's revolved and also temperature is moving again in A-tuning.
Unfortunately this means I cannot use sleep. Hopefully anyone has found a solution. My fan is 4-pin so if I connect that to 3-pin it will run at full speed.
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boombastik1 View Drop Down
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After you put the pc in s4 (hibernation or hybrid shutdown)in windows 10 and
then you restore the pc from hibernation the CPU temperature is stuck in the same temp.(the last temp when u put the CPU to s4)

To recreate this bug u need only the motherboard to work in uefi mode with cms on.
In pure uefi (CMS off) and in pure legacy mode this bug don?�t exist.

That is the reason that cpu fan stuck. (u need to have a pwm cpu fan also.
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boombastik1 View Drop Down
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Hallo again.
I made a lot of tests with a lot of fans and i can recreate it.
when i boot  i go into bios and i without change anything , i  save and exit ,when my system restarts the fan controller stacks and dont change rpm fan with temperature.  ( the most times not every time).

I also found the solution for this.i have a cpu pwm fan and two chassis pwm fans.
when i move my pwm fan to 3 pin cpu header, the other pwm fans works always. I cant recreate the bug.
So the 4 pin cpu fan header has the bug. When u have put a fan there not always change rpm with temperature and as a result it stucks also the other pwm chassis fans.

This bug exist in at least 4 models z97 asrock  motherboards.

So the conclusion is this.
If u want all the fans to works as intented dont use the 4 pin pwm cpu fan.

U can use all the pwm chassis fans and the 3 pin cpu fan.
(in my setup now i have a 3 pin cpu fan  in the 3 pin cpu header and 2 pwm chassis fans in the 2 chassis fan headers in a z97 anniversary)

Another solution is to put the cpu fan in a chassis pwm fan header and put a slow rpm chassis fan in 3 pin cpu fan header.
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donger View Drop Down
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Originally posted by boombastik boombastik wrote:

I have seen it myself in my motherboard z97 aniversarry.

In my case the cpu intel stock fan stuck at the same rpm and not arise with the temeprature.
THis is totally random.

But if i disable cms in uefi ( pure uefi), this dont happen, so maybe if u have the cms compatibilty to on , it brakes the initialization of fan.(random times)


thanks mate! after switching to ultra boot not a single crash!

I am 100% this is a bug. This should not happen.


Edited by donger - 29 Oct 2017 at 9:15pm
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donger View Drop Down
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Ok i set it to ultra boot now, was fast boot before. Unfortunately i never had any monitoring software ON when the crashes happened. All i know that after the crash, on the bluescreen, i open the case see the fan is spinning molasses like like and the megahalems is so hot i can't touch it. After i reset the PC the fan goes to 100% right away to cool down the CPU.

If this CMS thing is not gonna work i will just buy 4 pin fan.
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parsec View Drop Down
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Points: 4996 		Post Options Post Options   Thanks (0) Thanks(0)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2017 at 6:43am
Originally posted by donger donger wrote:

Originally posted by boombastik boombastik wrote:


But if i disable cms in uefi ( pure uefi), this dont happen, so maybe if u have the cms compatibilty to on , it brakes the initialization of fan.(random times)


i can't find it in UEFI, which tab is it on your board?


CSM is in the Boot screen. If you have the Fast Boot option set to Ultra Fast, the CSM option is removed, and set to Disabled. Also, IF you use the Ultra Fast option (which requires CSM disabled), that can cause side affects with the board's sensor chip, since it causes a shorter POST.

If you find the CSM option, you may not be able to simply disable it without other side affects.

BTW, thanks for the post/explanation that I can understand. So in 5% of the game launches, you get this problem. Intermittent problems are the worst to diagnose.

Monitoring software, including a board's UEFI/BIOS, can interfere with each other when they are running at the same time, and cause bad data to be read by one of the programs. MSI Afterburner is usually considered well coded, but if you have other monitoring programs running at the same time, that can cause the UEFI's control to get bad data in a temperature reading, and not act as it should.

Do you see a bad CPU temperature reading in Afterburner or HWMonitor when the over heating occurs?
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donger View Drop Down
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Points: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote donger Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2017 at 5:19am
Originally posted by boombastik boombastik wrote:


But if i disable cms in uefi ( pure uefi), this dont happen, so maybe if u have the cms compatibilty to on , it brakes the initialization of fan.(random times)


i can't find it in UEFI, which tab is it on your board?


Edited by donger - 12 Oct 2017 at 5:25am
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donger View Drop Down
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this is after 3 hours of playing Overwatch. I am telling you once again i have everything setup perfectly. It is just 5% of game launch the MOBO reads wrong the CPU temperature and doesn't apply proper voltageo to the fan so it stays on too low rpm
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