How to use only Performance-cores?


Feb 12, 2021

We have a new server with i9-13900. It has performance and efficiency cores. Is it possible to use only performance cores for the VM? Or is it possible to disable efficiency cores in Proxmox? Thanks.

CPU Specifications​

Total Cores: 24
Number of performance cores: 8
Number of efficiency cores: 16
Number of threads: 32
Last edited:

normally, the efficiency cores can be disabled in the BIOS/UEFI (and only there) - if there is no such option, you're out of luck basically on that front.

But you can pin vCPU to specific host CPUs using the affinity (or CPU Affinity in the GUI) setting. For the latter, it is exposed in the "CPU" tab of the VM creation wizard, as well as under Hardware -> Processors.

See this paragraph in the documentation for more information about this.


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