My build consists of: i3-8100, asus z370-p (with latest BIOS), CoolerMaster 212X. The cpu temperature rapidly increases to 70, when Linx is starting (in fist seconds of a full load). Peak temperature is 74 deg. Fan at 100% or 1600rpm (by mb controlls). I think it's too high for such cpu, isn't it? There is 65watts only. My previous xeon x5470 had 120w and never goes above 60-65 deg with similar cooler.
I tried to change a cooler and thermal compound. Test with disabled XMP gave the same result. In the end I checked surfaces of a cooler bottom and cpu.They are both flat.
The second strange thing is what the cpu voltage changes according to SpeedStep, but frequency is not. Is it normal? (SpeedStep option in BIOS is in enabled or auto state)(Maybe I must look at c-states in BIOS?)
I was reading your thread and it captured my attention immediately, I understand that you are monitoring the temperatures of your set up and I am very pleased to read that you take care of your machine's health and performance
Based on the Specs of your units let me point the following:
Your Intel® Core™ i3-8100 is (based on your description and screenshots) reaching peak temperatures up to 74 °C. This is actually fine considering that the CPU's max temperature will be 100°C.
Here you will find all the specs for your current CPU:
Your previous Processor (Intel® Xeon® Processor X5470) never goes above 60°C -65°C with a similar cooling solution. The actual reason why is because the maximum temperature for this unit is 63°C and the unit is intended to perform on lower heat ranges than your Core™ i3-8100.
Here you will find all the specs of your X5470 CPU:
In case that you still want to troubleshoot more, feel free to take a look to the following link and follow the recommended actions for troubleshooting when overheating is present on a system :
As well feel free to run a Diagnostic through our IPDT (Intel® Processor Diagnostic Tool) so you can be more confident on your system:
(You may need to copy and paste the links provided into a separate tab in case that you have issues when clicking on them)
I hope this helps,