Ryzen 9 7900x3d
Ryzen 9 7900x3d
I don't believe reducing the temperature setting impacts PBO, I think it's related to the chip design. Should we try PBO first, then apply Curve Optimizer? I began working with these two experts... I'm struggling to reach 5.75GHz on a single core, but I managed 5.45GHz across all cores at 83°C using less than 90W. Very satisfied with the results in terms of performance, heat, and power efficiency.
I adjusted the case fans and took off the rigid front cover to boost airflow. After that, I ran Cinebench with a PBO2 offset of -26. Next, I decided to individually tweak the PBO offset for each core, pushing them as far as possible. So far, the first two cores passed Cinebench at -30 offset. The second chart shows the pass with just the first core at -30, compared to the first and second cores together at -30 (the dual-core result is the brighter orange one, while the brown one shows a pass at -30 with only the first core). All other cores sit at -22 until their turn comes. I achieved a better score with just the first core at -30 than with the first two at -30. Probably just some random variation in the test. I’ll keep going until I spot any core that doesn’t hold at -30, then run just that one or those lower. I’m reaching 93°C after boosting the fans and removing the front panel.
I ran the full test on my 7950x using Ryzen's master, which suggested -30. After adjusting the BIOS to -25, I haven't encountered any problems.
It performed well at -30°C over three sessions, with consistent results during 10 minutes of continuous testing. I lowered the temperature to -20°C for extra reliability since it's my primary workstation. The maximum temperature was set to 85°C, only reaching that threshold during actual Cinebench runs. Performance stayed solid in gaming and other benchmarks, often just below 60%. I adjusted the ECO mode and increased each parameter by about 20-25% (PPT, TDC, EDC) manually. My goal wasn't to push maximum speed, but to achieve stable stock performance—about 200mhz faster across cores in Cinebench—and to have more runtime during power outages for safety.