Getting relevant hardware specs out of the way first. Please ask for more details if you’d like them.
Mobo: Aorus Master X570
PSU: Seasonic 850W Platinum
Cooler: Noctua D15 (2 fans)
Event: I (kind of) followed a video from Buildzoid on setting PBO values on Gigabyte X570 boards. I was experimenting with an all-core 4.2GHz overclock and wanted to compare it to PBO as it will operate around 4.2GHz. When I changed the BIOS settings it resulted in PBO working, but it was boosting near, and over, 5GHz on the effective clock in HWiNFO. AFAIK, the voltages and temps were reporting as safe and usable, but keep in mind I’m completely new to OCing and still have much to learn about what’s safe.
I thought this was just a readout error, so I ran Cinebench R20 and my score went from ~9400 to ~11300. I have two videos (with bad audio - sorry) showing two different Cinebench runs. I will upload one to Youtube, but can upload both if requested. I will upload a video of my BIOS settings and can list them here as well if requested.
I also wanted to test my RAM while it was like this and ran a full memory test using the DRAM Calculator for Ryzen. The test finished 100% with no errors. It was during this test the effective clock reported running over 5GHz. I took screenshots of HWiNFO during this test for analysis.
After making the videos, I restarted Windows and PBO worked as it had done last time I tested it. I was getting ~4.2GHz boost and ~9400 in Cinebench R20. I’m assuming this event was an anomaly, but am hoping for an explanation as to what could have happened. I’m also curious to know if this was actually safe for my hardware, or if I could have or potentially could have damaged something. If this is safe, I’m also curious if it’s possible to recreate. I’ve had no luck at this point to recreate it by repeating the steps I took. I saved the BIOS profile before the changes and after, so I have my start and end points preserved.
The LLC setting was left on from the all-core OC. It causes some of my resting voltages to be considerably high, but I’m unsure if it’s unsafe if its not under load. Just to be safe, I turn it off when using PBO. I have alarms set in HWiNFO for high voltages, but these were never triggered during the anomaly, so I didn’t even notice I forgot to turn it off.