New to Overclock.net
Join Date: Sep 2007
Location: Belle Plaine, MN
Need Help Demystifying Ryzen 3000
I've exclusively built Intel machines from the introduction of LGA775 onward but I decided it was time to try Ryzen since everyone seems to be raving about the performance and value.
I went with an X570 Aorus Ultra and a 3900X for my new setup. I updated the BIOS to the latest version (F6b) and away I went. Windows 10 installed without an issue and there were no signs of instability.
Once I got going I noticed that my case fans were constantly ramping up and down. I installed Ryzen Master and found the temperature fluctuating between 45*C and 70*C. The instant I attempted a video encode the temps shot to the upper 70's before I canceled it; easily besting the thermals of the notoriously hot 9900K I have in another setup.
Corsair H150i Pro with x3 120mm (mounted top as intake)
Lian Li Dynamic O11
x3 120mm case fans (mounted side as exhaust)
I went to the internet and found what appears to be some general confusion about how Ryzen 3000 works and what to expect while using it. Most of this seems concentrated on voltage and boost behavior.
I chose to set CPU voltage to "Normal" as opposed to "Auto" which I found posted in numerous places. For my motherboard, this meant 1.225v. Once I got into Ryzen Master again, supposedly one of two tools (the other being CPU-Z) that will accurately represent Ryzen 3000 telemetry without introducing the "observer effect", I found that the voltage was right around that 1.225v and I was idling in the high 30's. Great! It's worth mentioning I was using the "Ryzen Balanced" Power Plan.
I then loaded up another MP4 encode and attempted to render it. Temps shot up into the 70's and I saw 1.45v+ in Ryzen Master. When I stopped the encode, voltage went back down to 1.225v and the system cooled off. I could reproduce this at will. I noticed that when setting Ryzen Master to Manual Mode, the "Peak Core(s) Voltage" was set to ~1.45v. I lowered this down to 1.25v and went back to another encode.
This time, temperatures were sub-70 but I noticed that Handbrake was only using ~85% of the CPU potential. If I reset the Peak Core Voltage back to default I got 100% utilization again but I also got high temps again as well.
Reminding everyone of my AMD-ignorance mentioned above, this 3900X seems like a basket case. My PC is used for gaming about half the time and video editing and rendering the other half. I love the performance boost in Handbrake and Premiere but at the same time I feel like I'm trying to cool a fusion reactor. Yes, I did check to make sure I was getting good contact between CPU/TIM/AIO.
For reference, my 9900K with the same case/cooler peaks around 70*C after a long encode using Handbrake (which uses AVX). In fairness I do have a -100Mhz AVX offset (so 4.6GHz per core when fully loaded with AVX work)
I'm also concerned about that 1.45v+ I'm seeing on sustained heavy load with a 7nm CPU. Assuming I could somehow cool this thing I can't imagine that's a good voltage for sustained load. I've confirmed this voltage behavior with CPU-Z and HWInfo as well. All three agree.
What am I doing wrong?
Last edited by MNiceGuy; 10-21-2019 at 02:01 PM.