Thread about Ryzen 7000 undervolting and PBO curve tuning
Thread about Ryzen 7000 undervolting and PBO curve tuning
Sorry for the slow reply. I've been having some other issues, and wasn't sure myself what the state of things is now. I haven't tested in any games yet, as I still don't have a dedicated GPU in this PC. I need to finish some games on my old PC that will likely not work if I try to copy them over, due to sensitive mods and tweaking, before I take the RTX 3080 out of that PC and put it into the new one. Here's Cinebench with the offset (20174), and without it (19353). The spread on separate 10-min Cinebench passes can be pretty wide (I think perhaps up to 1000 points), but the offset profile tends to come out ahead. After doing all this, and it passing testing for 13.5 hours, and then starting to adjust some other things in the BIOS, I had another reset, while not really doing anything with the PC. I set the offset BIOS back to stock, and cancelled other changes I'd made in the BIOS, and I got two reset in short succession with the BIOS at stock, other than the RAM at the EXPO II profile. And then when I put the offset back on, I was consistently getting crashes during testing within 7 minutes of starting the test. I also experimented with setting a temperature and power limit in the BIOS. I was able to set a temp limit, though setting a power limit didn't do much - power under load changed from 145w to 138w. I then reset the BIOS to default. After doing that, my PBO offset stopped crashing during testing, even though it's set the same as it was when it was crashing every <7 minutes under testing, which was also the same as it was set in my earlier testing when it was stable. But I still have seen an occasional random crash while the PC is not doing anything in particular. Also, after resetting the BIOS to default, setting a temperature or power limit in the BIOS no longer has any effect in the OS, the CPU runs at 92 - 95C under heavy load, and draws 145w of power. I've reset the BIOS a couple of more times, and setting a temp or power limit still has no effect whatsoever. I'm wondering if this is due to a bug with the BIOS software, and I've contacted Asus about it, and they've sent me a form with questions to answer. One other things is that, right before resetting the BIOS to default the first time, I noticed the max frequency my CPU was hitting during testing was 5.0 Ghz. After resetting the BIOS, I've seen it hit 5449 Mhz for a second or brief instant at the start, but then top out at 5225 Mhz from there on. I'm guessing that's normal, but it's something I'm curious about. The 7700X has an "up to " 5.4 Ghz boost clock. I've just re-seated the RAM DIMMs, as I've read that random restarts are often caused by the RAM or PSU. And I've entered my tested-stable PBO offset again. I'll see if I get any more resets. I hope that will put an end to any more random crashes. I'll find out as I use it.
Adjusting the BIOS temperature and power limits hasn't made a difference for me. In the operating system, under heavy load, the CPU continues to operate around 93°C and 145 watts. I attempted to modify power settings using Ryzen Master, changing only three values: PPT to 88, TDC to 75, and EDC to 150 – the recommended settings for the 7700X Eco mode. After saving, I clicked Apply, which prompted a restart. When I confirmed the changes in Windows, it restarted normally. However, the system failed to boot afterward. It remained on the motherboard's DRAM indicator for about 25 minutes before I powered off the PC at the power supply unit. After turning it back on, I tried to start it again, but it still didn't boot. Eventually, I powered down the PSU, removed the power cable, and briefly discharged the CMOS battery while holding the PC case's power button for a few seconds. Once I restarted, it worked. I re-entered my stable PBO offset values in BIOS but didn’t change the temperature or power settings. When I booted into Windows, temperatures and power readings dropped significantly compared to before. Ryzen Master displayed the same PPT, TDC, and EDC values as I set them manually, yet the system still wouldn't post. In Cinebench, I observed much lower temperatures and power usage than usual. This suggests that while BIOS tweaks didn’t help, Ryzen Master did alter the numbers. My current PBO settings gave me around 20,000 points in Cinebench with 93°C and 145W draw. I’m considering slightly increasing these values to try and improve performance. The recurring issues with the motherboard—random restarts even when BIOS defaults are correct—make me think it might be a hardware problem. I’m planning to contact Asus for further assistance.
I don't think the limits are being applied correctly. I'm receiving identical results at 80c and 80w. You're pushing performance to its limits, but you're still getting similar outcomes. Your comment about the motherboard is valid, as well as the mention of the 5.4GHz rating on these chips—it's the single-core frequency. That single-core figure matters a lot. You're doing fine. It might be that the board is faulty or your CPU isn't being properly classified. I'm surprised my B650 outperforms your 670-E board, which is at the higher end of their specifications.
I believe that once you exceed a certain threshold, a mobile cooler provides enough capacity for a CPU to function consistently. The premium coolers focus more on extra features such as additional M.2 ports, quicker PCIe speeds, and more high-speed USB connections. Your AIO might be delivering slightly better performance. However, I’d like to explore other factors influencing this. I’ve noticed many 7700X systems running at 95°C and consuming around 145 watts—this is the intended power range for the CPU with the same cooler. https://www.thefpsreview.com/2022/12/02/...~:text=24% more power.- Temperature, at with the same cooler. https://www.guru3d.com/articles-pages/am...iew,7.html In this test they achieved 19,083 in Cinebench while running at 95°C. Using offset and Eco settings, I’m seeing similar results at 32°C with a drop of about 55 watts. That’s quite solid. I plan to increase the CPU power output slightly. https://www.pcmag.com/reviews/amd-ryzen-7-7700x