Is a 650w PSU good enough for Radeon RX 580

Surprised you are stable on that configuration, normal recommended psu for a 9 series cpu is 650w minimum. Figure on @300-350w just for the pc, before any gpu considerations. Moving from the 7870 to the 580, I'd add another 100w, be looking at a decent 750w instead.

The ORIGINAL V700 by Cooler Master is a great PSU made by SEASONIC ,That 650w is made by Enhance Electronics and is decent.

220w cpu
240w gpu
120w pc

That's power consumption rough maximums before any OC, 580w. Gaming will be @75% of that. You'll squeeze in with that 650w, but with that cpu I'd be watching power usage rates.

There isn't a better cpu than what you have, the 9 series FX was toted as top of the line, but that's debatable when faced up against the stability and heat issues, the FX 8350 being far superior there for the same results.

Wait, you're running a 9370 with the stock cooler from an 8350? What sort of temps are you seeing under load? Are you sure your CPU frequency is actually staying at 4.4-4.7 GHz under sustained load?

That you'd have issues with an 8350 heat/stability and not have said issues with a 9370 with the same mobo/cooler makes no sense...

Elite 430. Miserable in every way from build to airflow.
780T. Arguably one of the best cases ever made, in every way from build to airflow.

Yes, the M5A99 FX Pro R2 supports the 9 series cpus. Barely. The heatsinks on the VRM's are laughable, almost always the cause of failure and instability due to overheating.

Fx9370 stock clock is 4.4GHz, Turbo 4.7GHz. So depending on the software, you'll get both results as turbo is default ON, but programs mostly just read the stock bios info, not any OC related stuff. Turbo is a factory set OC.

The FX don't have on-core thermal strips the way Intel cpu's do, so you won't get accurate temps via software. The best you can get from cpu temps is from the sensors 'under' the cpu, which is the 'cpu temp'. Package temp is different again, as is socket temp. The actual TDP for all the FX cpus is 62°C, if that could be read from the cores. Which it can't. Because the 'cpu temp' isn't cooled the way the lid is, it runs hotter, so cpu temps shouldn't exceed @72-75°C or you are now into damage ranges.

The best software to use for the FX is Amd Overdrive. It reads bios info for temps, which is the most accurate, but works backwards to standard usage. It has a maximum temp taken directly from the cpu itself, this having a value of 0. The closer you get to 0, the closer you are to cooking the cpu. Nominal Overdrive temps should be in the 20's anything less is very hot, and if you ever see negative numbers you are damaging the cpu and run a good chance of thermal shutdowns. When dealing with FX cpus, the exact number is not important, the relative number is. Teens is not good, 20's is OK, 30's is better.

The 9 series FX came originally with a corsair h80i equivalent liquid cooler for a reason. The 140w 8 series stock cooler is in no way capable of maintaining healthy temps on a 220w cpu running all 8 cores at turbo clocks. Under full loads, there's no way that your cpu is not throttling down to at least mid 3GHz clocks, unless you are only running 1-2 cores in which case the cores themselves are overheating and radiating heat for a lower combined temp.

Either that, or the pc is sitting next to an open window and you live in Siberia.