Z97 Extreme 3 has bugged CPU FAN control

I bought a ha-swell e3-1230v3 and this problem don't exist.
It seems to affect only ha-swell refresh CPU.

change the ps2 y-cable from ayto to enable.

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.

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.

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.