Try stress testing the GPU and PSU with OCCT software. It is free and stand alone. No need to install.
First try with GPU Test with Errors and see if the GPU crashes. Keep a close eye on Temps and PSU Outputs during the stress test. If it passes then run the PSU Stress test and again keep an eye on CPU and GPU Temps and PSU Output voltages. See if it crashes.
The above is just to test for Overheating and Stability of your hardware. The stuttering is a different issue probably related to the AMD driver or a configuration issue.
Testing for 5 minutes without errors, I just stopped because the video card was almost 90°C, usually in games is between 65-80°C, I want to solve the problem of stutterings, psu seems stable since I did not see mistakes.
You said it could be related to some amd driver or some configuration, I've already tested a lot of amd drivers and I've always had problems, so I don't think it's about the settings, I've changed a lot in windows and bios, never improves or gets worse, always continues with the problem.
Anyways, here are a few AMD Threads, previous and current, about RX580 and stuttering. Maybe one of them can help:
RX580 Crashes after stutter sound during games (You can use OCCT PSU Stress test to check if your PSU is strong enough under heavy CPU & GPU loads).
Many more where Users opened threads about the RX580 and Stuttering but with no replies. If you want you can input in the "search box" "RX580 STUTTERING" then click at the bottom of the search "Search All Results" and you will get a lot more threads to look at.
Make sure you have the latest AMD Driver installed first from here: https://www.amd.com/en/support/graphics/radeon-500-series/radeon-rx-500-series/radeon-rx-580
Then you can try some previous AMD Drivers from here: https://www.amd.com/en/support/previous-drivers/graphics/radeon-500-series/radeon-rx-500-series/rade...
Make sure your Windows 10 is fully updated via Windows Update. Also disable FreeSync if that is enabled and see if stuttering continues.
Browse through the above links and see if any of the solutions offered helps your problem of stuttering. Seems to be fairly common with the RX580 and other GPU cards.
I've looked, tried to solve here but still the same, until today I found no one with a problem similar to mine, I decided to record 2 benchmark videos for you to look and maybe direct me to something. I used the superposition benchmark program, in the first benchmark, monitoring with HWInfo and in the second seeing through the task manager, it is noticed in the two benchmarks that in the part that I take the chair and I am moving very fast on that table, the use of gpu decreases. enough.
1° - Benchmark - YouTube
I would avoid the minimum as most of the time when added components find their way into a rig, poof
This is why I use 850W or better power supplies. The HX1000i is simply even more conservative.
Never skimp on a PSU, you rig is very dependant on good power.
120mm, I bought a thermal paste and fan from the cooler master, I think that changing the thermal paste of cpu and gpu, also putting a better quality fan, will decrease the temperature.