Ryzen 7950x Tuning with Precision Boost Overdrive

Looking to undervolt my Ryzen 7950x using Precision Boost Overdrive (PBO) tuning settings in the advanced section of my motherboard BIOS to bring temps and thus my desktop's noise levels down, without an appreciable change in performance.

Tuning

Stage 1: Bring down the PBO curve optimiser offset in negative steps of 5, down to maximum of 30.

• -05: 5.2Ghz @ 215w down to 5.1Ghz @ 205w after 20 minutes.
• -10:
• -15:
• -20:
• -25:
• -30:

Step 2: Decrease max power draw with the goal of 5.2Ghz across all cores at a lower power rating.

• 200w:
• 190w:
• 180w:
• 170w:

Testing

1. Long-duration all-core test.

• 8 hours smashing the CPU to test max temps and power draw.
• Can be run overnight easily. Wouldn't expect many failures.
• Run with the command sudo ./long-test.sh and then inputting your password to run as sudo.

2. Short-duration per-core test.

• 2 hours smashing each core/thread to test for stability of per-core limits.
• Individual cores can often have different minimum PBO curve optimiser offsets.
• Run with the command sudo ./core-cycler.sh and then inputting your password to run as sudo.

3. Idle test.

• 8 hour test of the PC on idle, followed by a 24 hour test.
• Test most likely to fail, as we are trying to have the CPU run on as little power as possible.
• Conveniently (not) also the most annoying test to run...
• Script still TBC

References

• [LINK] Great overview off YouTube but misses some key testing points.

More indepth guides off Reddit:

• https://old.reddit.com/r/Amd/comments/khtx1o/guide_zen_3_overclocking_using_curve_optimizer/
• https://www.reddit.com/r/Amd/comments/qik4t3/zen_3_pbo_and_curve_optimizer/
• https://albertherd.com/2020/12/13/my-experience-with-precision-boost-overdrive-2-on-a-5900x/