Z790-A D4 motherboard reported CPU temperature in BIOS (and HWINFO) stuck at 11 degC

[NMflyer]

I have/had same problem reported in previous unresolved post by Zerosystem (closed due to inactivity).  After swapping CPUs on Strix Z790-A D4 motherboard, the BIOS reported CPU temperature was stuck at 11 degC on various BIOS pages and HWiNFO motherboard sensor display.  CMOS resets, re-flashing BIOS and other suggested remedies for similar behavior found in internet search did not resolve the problem.  Motherboard reported correct CPU temperature with previously installed CPU, and replacement CPU's temperature was reported correctly in previous motherboard ((Strix Z790-E).

Having seen that various forum complaints of erratic RAM performance following CPU install were frequently resolved by remounting CPU, I decided to give that a try out of desperation.  After removing and re-cleaning AIO, CPU and Thermalright frame, the installation was repeated ensuring CPU frame and AIO fasteners were carefully tightened using alternate corner technique until each bottomed.

Following CPU remounting, the BIOS CPU temperature was reported correctly both in BIOS and HWiNFO.

None of the reports of similar behavior found in my internet search included a confirmed resolution, so I created this post to hopefully help others resolve this problem without resorting to warranty claim.

[Silent_Scone]

Hi @NMflyer 

 An improper mount may have an impact on some of the CPU's DTS sensors but I'm not aware of any cases where it would result in a reading this low. Thanks for the info and making the time to make the post.

[NMflyer]

Since the BIOS and HWiNFO motherboard CPU temperatures were "stuck" at 11 degC, it seems more an invalid sensor indication than low temperature reading.  Ran a few moderate load CPU tasks to confirm HWiNFO reported Intel CPU temperature increased as expected, while the motherboard CPU temperature remained stuck at 11 degC.

Internet search found numerous reports of BIOS reported CPU temperature stuck at 11 degC, some dating back to early 2010's.  Unfortunately, there were no confirmed resolutions to the problem.  It would be nice if ASUS, etc. could confirm that 11 degC indicates invalid sensor, but found no reference to that in my search.

[Silent_Scone]

I think it's fairly obvious that a DTS reading from a core or package temperature that low is invalid, didn't mean to suggest it was a low reading. Failed sensors are uncommon but not unheard of, also. The only mystery is as to why it started working, which may indicate a mount issue.