Z170 Extreme 7+ reporting incorrect CPU temp

Thank You Xaltar for the explanation!
I wonder why there is no such information in the manual or in the UEFI itself? AsRock should put it there! Users would know that their hardware is fine. It's stupid that we need to learn about things like that from the forum and not from the manufacturer... 

Have you ever found a solution to the problem? I have a Z170 Ex 7+, a 6700k with a Kraken X61 and I get the exact same temperature in Idle in the BIOS :/!

chris74flva wrote: I've noticed the same exact thing. I also just completed my personal Skylake i7 6700K system. My UEFI CPU temp shows 47 degrees Celsius. This is at idle! I'm using a Cryorig H7 CPU cooler w/ 120mm fan. The CPU lid is covered well w/ Arctic 5. Is it possible that a 6700K is running at idle at such a temperature? Could this be another 4770K story?

If you read my post above, you would know some of the reasons why your CPU temperature is 47C.

I'll also add when the UEFI user interface is running, how do you know that is an idle condition? Do you know what the CPU usage of the UEFI user interface is?

Does your board's OC Tweaker screen have an option called Boot Performance Mode?

If it does, what is it set to?

What is your VCore when in the UEFI?

I've noticed the same exact thing. I also just completed my personal Skylake i7 6700K system. My UEFI CPU temp shows 47 degrees Celsius. This is at idle! I'm using a Cryorig H7 CPU cooler w/ 120mm fan. The CPU lid is covered well w/ Arctic 5. Is it possible that a 6700K is running at idle at such a temperature? Could this be another 4770K story? 

It might be a bad sensor, but the CPU temperature data is a very basic thing and the way it is accessed is well known and has been done for years, as you know.

Also, programs like HW Monitor should be reading the same CPU temperature data as the board does and displays in the UEFI/BIOS. That would mean the sensor chip is not bad. OTOH, there is more than one way (sensor chip) to get CPU temperature data.

In theory it is possible that the UEFI has a bug that is reading the wrong data or translating it wrong from the raw data provided by the CPU.

I would try running a few different hardware monitoring programs, such as HWiNFO, which IMO is one of the best:

http://www.hwinfo.com/download.php

I would also try your board's A-Tuning program provided by ASRock and see how it compares to the UEFI and other programs.

When in the UEFI/BIOS UI, none of the CPU power saving options (C States) are active, so the CPU is not idling in a low power state. If you run a monitoring program immediately after Windows starts, you'll see the CPU cores running at their highest speed, and after ~30 seconds they will change to their idle, low power state, if the CPU power savings options are enabled. That is why the CPU temperature will be somewhat higher in the UEFI UI. But 100C is way to high, and 47C is also more than I've ever seen while using a UEFI/BIOS UI. Unless the CPU cooler is not correctly.

You might have found a bug in the UEFI, but IMO you should test that for a while before deciding that is the case.

Did you try clearing the CMOS/UEFI, and then check the CPU temperatures in the UEFI and Windows?

What UEFI version are you using? The latest version is 1.60:

http://www.asrock.com/mb/Intel/Z170%20Extreme7+/?cat=Download&os=BIOS