Hello,
I'm looking for some advice regarding the following issue I've come across (only) a few times over a period of about 5 months since I built my new PC (1st time builder).
After windows 10 boot, Core Temp (v1.17.1) showed a temp of around 90 degrees for my Ryzen 9 5950x while idling on the desktop and a Max T of more than 100 degrees (from loading win10). First time this occured (several months after building PC) I shut down the PC immediately, 10 seconds later I rebooted and everything was normal, i.e. idle around 33 deg and a Max of 53. When playing CPU intensive games in VR max temps I usually see are 72-74 deg (generally spiking from loading stuff from my NVMe drives), 10 min of CinebenchR23 multicore test yields much lower temps, i.e. around 50 deg although I must admit that I have limited my PPT levels in BIOS (I'm fine with that, noise levels are reduced while performance is still great); I btw also reduced the temp limit for thermal throttling in BIOS.
The 2nd time a similar scenario played out (much later), I was initially looking around in BIOS for a couple of minutes to check - not change - something and then the temps were totally normal (35 moving slowly up to 40 over the course of a couple minutes) and all my fans were spinning normally, but when exiting BIOS (without changes or reboot) and arriving at the desktop after loading win10 I saw that temps were abnormal again, a max of 105 and idle around 95. Overheat protection from Core Temp (which I enabled after the first occurence, i.e. about 5-6 weeks earlier) kicked in and the PC was restarted (setting in Core Temp was to put PC asleep in case of overheat, so I assume restart was initiated by the BIOS ?). Subsequent boot everything returned to normal.
My cpu cooler is a Noctua NH-D15S to which I added a 2nd fan. All fans seem to be working normal, case is Phanteks p600s with 2 fans in the front and 1 in the back. These 3 case fans are connected to 1 hub. The 2 CPU fans are well connected to their respective headers on the MB (ROG Crosshair Viii Hero Wifi).
I don't understand how these abnormal high temps can only occur 2 times during a 5 month (almost) daily usage and only after win10 boot, i.e. never when actually using the PC during CPU intensive tasks (Cinebench, flightsim in virtual reality, etc.). I now recently removed my PPT limit in BIOS and now with stock settings (PBO off) everything continues to be normal. But very possible that I will sooner or later run into a 3rd case of overheating, the question is when.
I understand that too much thermal paste can cause temp spikes and since this was my first PC build I know that I certainly used a bit too much to err on the safe side, but I didn't use crazy amounts IMO. I remember that I tightened the cooler base very well to the CPU as well. And wouldn't too much paste not result in more frequent and continuous temp problems than I observed ? I want to stress that I had only 2 such events over a period of 5 months.
Can it be a spurious reading in Core Temp ? As far as I remember the sound of my fans was not abnormally loud when it happened. Next time this happens I will certainly crosscheck with HWinfo64.
Many thanks in advance for some tips and/or insights !
