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Are Ryzen 3000 temps really being displayed properly in Windows?

Question asked by bradfromsigep on Sep 7, 2019
Latest reply on Sep 8, 2019 by waltc

So I just completed my latest build and my entire first day was basically spent troubleshooting temp issues with my Ryzen 3700x. Or so I thought. From the moment I loaded into Windows I noticed my CPU temps fluctuating rapidly at idle (or essentially idle, at most having Chrome with a few tabs open) anywhere from 60C to as high as 80C. I tried reapplying thermal paste and reseating my CPU cooler to no avail. After doing a bit of research, I pinpointed the main culprits as the precision boost overdrive setting in the BIOS and the Ryzen power plan in Windows. With PBO disabled and my power plan set to "power saving", my CPU now idles around 45C, with little fluctuation. Of course, when I change these settings it goes back to fluctuating massively at higher temperatures. However, what makes me suspicious is that there's no steady buildup. The second I change the power plan back to Ryzen, it's an instant 10-20C increase. I've also noticed that the temperature stays at a steady 45C after sitting in the BIOS for over 30 minutes. At this point I'm almost convinced that CPU temps aren't being displayed properly and it's actually cooler than is indicated. I've tested this with Ryzen Master, HWMonitor, and CPU-Z and they all show the same results. 45C idle and as soon as I change these settings, massive fluctuations. I'm not really sure how to proceed here. I'm concerned that using a power saving plan will affect my performance and that the temperatures aren't actually as bad as these programs are saying they are. Considering just going back to default settings and not worrying about temps. Thoughts?