I've just recently upgraded my power supply from a very cheap, non 80+ EVGA 400w to an EVGA SuperNova 550 G3. Before the upgrade I was running 3.8 Ghz at 1.275 V with no issues at all. Since the upgrade, my CPU has been throttling down to 1.55 Ghz and can't even seem to maintain stock clock speeds. I know that this "bug" can happen when trying to overclock, and I don't know the exact cause of it, but my theory right now has something to do with the CPU power connector. On the old power supply there was a solid 8-pin connector, and with this new one there is a 4+4 (which was put on backwards btw -_-)
I tried going into the BIOS and changing everything back to stock. Auto clock speed, auto voltage. I then opened up Ryzen Master and watched it for a while, the voltage was jumping around from 1.2 to 1.35, which is scary. Then it would just throttle and revert to the 1.55ghz at like 0.8 volts.
Side note- right after I turned the PC on for the first time, I ran a Cinebench at 3.8 Ghz and got a matching score. Somehow it was able to do that fine.
I can't tell if the CPU is not getting enough power, or if the voltage is all messed up. Maybe I have a bad cable? If anyone has experience with this please help.
Specs-
AMD Ryzen 5 1600
Asrock AB350 Pro4 ATX
2x8 GB Ripjaws5 2666
EVGA 1060 3GB SC
EVGA SuperNova 550 G3
Fractal Design Meshify C