DaveInPhilly

Thanks, Jerry. I am monitoring the problem in the BIOS. There is no software running. So it must be a hardware issue.

I have had this Ryzen 5 5500 in my system for several months now. This week I upgraded the PSU to a Toughpower Grand RGB 850W. Immediately I noticed that a fan would ramp up for a second and then immediately slow down. This happens every 10-30 seconds. As I was checking the fan curves in the BIOS I noticed that the CPU temp was spiking from 30 degrees at idle to 60 degrees and then falling right back down. This has to be related to the PSU because it coincides directly with the new PSU going into the system. Any ideas? System: Gigabyte AB350M-DS3H-CG R5 5500 RX 6600 1tb NVMe 2tb SSD 32g DDR4 3600