Undervolting VS PPT?
Undervolting VS PPT?
Seems you're hitting the edge of performance… -0.125 offset works well, but -0.250 doesn't seem to help much. I also adjusted PBO Advanced to +150mhz (offset), but it doesn’t appear to make a big difference. The system is running near its 88W limit and PPT levels… I’m curious if there’s a BIOS setting to change that, though. Temperatures are around 71°C across all cores, and I’m at about 4.1ghz with 100% performance. Probably worth testing a +200mhz PBO offset, but I doubt it’ll help much now that we’re near maximum power and PPT.
I adjusted PBO limits from auto to motherboard, and the percentages are now much lower. Performance hasn’t changed much or at all…? My idea that more PPT headroom helps doesn’t seem to work. Is raising the wattage limit a good approach? It seems I still have enough thermal headroom. Also, why does the clock offset of +150 have such little effect? The CPU doesn’t appear to be trying to reach 4.2GHz anymore after updating the BIOS? It’s a bit confusing.
I track these specs: 5600X with 200 PPT 140 EDC & 180 EDC, and 5900X using 200 PPT 130 TDC 130 EDC plus a -30 on both. If I were you, I'd push harder than cinibench to see the CPU limits. Record those numbers, input them into PBO Advanced for tuning. I prefer Linpack Xtreme, 8GB RAM, and start it now. Hope your cooler handles it—expect significant performance drops, but that's the goal.
I considered options that might require more power, tried p95 which used less heat. It seems temperatures are actually influencing things more than I realized—today’s room is 3C hotter, and the CPU runs about 1C warmer than yesterday with the same settings. The max is now 72°C, and frequencies are a bit lower, like 3.95 instead of 4.1 at full load. It feels a bit excessive for just a 1°C change, but I’ll give it a shot. Regarding the "+200 -30 on both"—what you meant?
Running both CPUs with p95 on a small FFT size of 128k might be useful. Let me know if that helps.
This setting works well at roughly 1.325 volts for the entire core and load.