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PC Processors

tharpley
Journeyman III
‎03-30-2023 05:54 AM

7900x3d core preference not working with boost clock override enabled

Hi,

When I enable a boost clock override in the BIOS, I've noticed the non-gaming CCD preference in Windows changes to the vcache cores (CCD0). This negatively impacts single core performance and benchmarks and is not the expected behaviour (with boost clock override disabled the frequency cores are preferred as expected).

Has anyone else had this issue? I'm using a 7900x3d with a Gigabyte X670 AORUS ELITE AX motherboard on the F7c BIOS (AGESA 1.0.05c).

Thanks

1 Reply
marathonman
Journeyman III
‎03-30-2023 12:41 PM

Oh yeah, I have the same thing with a 7900X3D on an Asus ROG Strix E-F with AGESA labelled 1005c_RC3 in the BIOS - probably very similar.

It was playing nice when I first installed it, but switched on boost override a couple of weeks back and now I look at it, cinebench r23 single core wants to spread threads over CCD0.  When I put override back to auto it behaves as it should and starts using a smaller number of frequency cores.

I had also failed to get CPPC dynamic preferred cores to do anything in the BIOS, but when I roll back the override, this does appear now to result in the frequency cores being favoured.

Good catch!!

Asus looks to have a new BIOS based on 1.0.06 published today but no explanation of what it does and I won't rush to install it