Moved SSD from one motherboard/pc to another -> Higher temperatures and fan speeds

[othenone]

Hello!

I have recently upgraded my homelab server. I moved from a Optiplex Micro 7090 with i5-10500T to a Optiplex Micro 7000 with i5-12500T. This upgrade was done by moving my SSD and RAM over to the new mini pc.

After the change, i am experiencing higher temperatures and fan speeds overall. After researching the topic, i have the following possible reasons the temperature and fan speed are higher in the new pc:
- The heat release of the new mini pc is not as good as the old one. This could then be the fan not being effective or the heat is not led well enough to the cooling block. I have plans to put new thermal paste onto the CPU of the pc, but havent found the time yet to do so.
- Changing pc leaves configurations in proxmox not customized for the new CPU, which might make them inefficient in some way.
- The new pc simply emits more heat than the old pc, therefore, there might not be anything that might substantionally get the heat and fan speed down.

What i would like to know from the community:
Could there be any configurations within proxmox that causes these CPU temperatures and fan speeds to go up? What could these be? I have considered backing up all vm servers and make a fresh installment of proxmox onto the new pc, but i dont know if it makes sense to do so.

Additional information:
- Previous pc: around 2200 RPM fan speed with 50°C cpu core
- Current pc: around 3200 RPM fan speed with 56°C cpu core
- All temperatures and fan speeds with a CPU usage of around 1.0% of 12 CPUs.

 

[news]

And what do you expected?
You got the CPU with more power and the new system so ask the manufacture.

 

[meyergru]

Unless you use some Linux tools to set it explicitely, the actual power modes are determined by the BIOS. Both Intel CPUs should use around the same power when idle, the difference is the ACPI settings which determine how deep the sleep states can go.

There is a tool named cpupower, which can be installed via "apt install linux-cpupower". I use it like this:

cpupower --cpu all frequency-set -g powersave
cpupower --cpu all set -b 6

This means: Use the "powersave" CPU governor and a performance bias leaning a little to the higher side. You could use 15 instead of 6 for maximum power savings.

However, the maximum ACPI C-states are also dependend on the chipset and peripherals installed.

 

[othenone]

And what do you expected?
You got the CPU with more power and the new system so ask the manufacture.

I would think with a higher rated CPU, the power usage might be lower and more efficient for the same task and load, but i might very well be wrong.

If i want answers regarding CPU specs and power usage, then i will ask about that in relevant forums. In the Proxmox Forums, i would hope some knowledgable Proxmox user could let me know if there could be mismatched configurations in proxmox regarding switching CPU that could cause these higher power usage. If someone can confirm that there should not be any mismatches and Proxmox registers the new CPU correctly, then please let me know, then i'll check that point off the list and move on to other forums.

 

[leesteken]

Your new CPU turbos to 75W (from the base 35W) while the old one is 25-35W. Maybe disable Intel Turbo Boost in the BIOS? This is really not specific to Proxmox and there are probably underlocking and other efficiency guides on the internet that apply to your setup.

 

[proxuser77]

In the Proxmox Forums, i would hope some knowledgable Proxmox user could let me know if there could be mismatched configurations in proxmox regarding switching CPU that could cause these higher power usage.

I think, you're approaching this from the wrong end, and in my opinion, that's the less likely scenario. I'd even say no. The CPUs aren't that different, and unless you've done some very specific tuning on the old system that isn't compatible with the new CPU, I don't think Proxmox or the Proxmox kernel will behave much differently there.

could cause these higher power usage.

Are you sure it actually uses more power?

II think it's much more likely that one of the other things you listed is causing the issue . CPU paste, and/or a less efficiant fan. And yes, if the airflow in the case is different or the CPU cooler is different, that can have a big impact, but you probably can’t change much about that in a Dell SFF PC. Partly because of small form factor, and partly because everything is proprietary. A standard CPU cooler probably won’t fit in there, even if it is a tower.