I recently upgraded to a 7950x3d for the increased core count and additional L3 cache when gaming. The chip is split into two CCD's with 8 cores each, only one ccd (cores 0-7) has the stacked L3 cache. I would prefer if unraid used a core from the second ccd and assumed that if I isolated the first 8 cores for VMs unraid would automatically switch to using core 9 but that wasnt the case. I still saw utilization on core 0 with no vms running and also experienced some unresponsiveness/instability. Is there a way to manually change which core unraid uses to something other than 0?

As far as I know you cannot stop Unraid from using core 0 (and any hyper-threaded companion core).   I think is is built into the Linux/kvm level.

Got it thanks! Ill have to just isolate 1-7

On 1/4/2024 at 4:58 PM, fadynakhla said:

Got it thanks! Ill have to just isolate 1-7

How is your performance with this config? I'm thinking of doing the same, but I'm curious how close to bare metal performance I'll get. Also, did you figure out how to isolate CCD's by chance? Thanks!

On 7/27/2025 at 7:18 PM, elithegreat97 said:

How is your performance with this config? I'm thinking of doing the same, but I'm curious how close to bare metal performance I'll get. Also, did you figure out how to isolate CCD's by chance? Thanks!

Hey, performance is great! When gpu limited its within a few percent of bare metal from my testing. In CPU limited scenarios its a bit more of a hit but its also a core configuration that doesn't have a direct competitor. Not sure you can isolate the full v cache ccd, I used some cli tool from within unraid to generate an image of the cpu topology and that basically told me that cores 0 - 7 are the v cache ones but unraid needs core 0 so I isolated cores 1-7 and passed those to the windows VM.