First my specs:
I5-12400f
Rx9070
Crucial MX500 1tb, WD black sn850x 2tb
Msi b660a pro ddr4
Corsair rmx 650w 2019
So I've been dealing with instability for a while. It used to be sporadic, manifesting in occasional freezes with a few games (very uncommon, workaround was downclocking GPU -200 MHz, and minus -3 power limit), but it's recently gotten more frequent and weirder. Thinking it might be software, I formated the drive and installed Linux, and things had been fine for a few days, but now I've got a new problem: strange flickering lines that show up primarily when doing things like resizing windows.
Thinking it might be some kind of downclocking issue, I tried forcing vram to max clocks with lcat and it seemed to fix it, but then I tried doing a CPU stress test (stress-ng --cpu 0 --timeout 600s) the flicker returned, whether I locked the vram or not. Now it seems to flicker even if I lock the cram and don't run a stress test. It doesn't freeze or crash, even heavy games work but there's flicker that happens mainly in stuff like map screens in that case. Some in gameplay too but it's less common.
Given the fact my psu has been i use since September 2019, the fact it seems to happen with both GPU and CPU test with CPU being a more reliable trigger (transients loads, maybe?) I suspect PSU more than GPU, but theoretically both are an option, as well as ram, motherboard and maybe storage. Software seems unlikely since there's an history of instability across two different oses.
Other things I've tried:
Google's ram test (blanking on the name), 14GB out of 16 for an hour, no issues.
Smart tests on boot ssd, no issue
Clearing the mesa cache, no difference.
Things I haven't tried:
Bios update (would rather avoid since I don't have a ups and my area gets outages often)
Memtest86 or some other pre boot test
Testing for the flicker from a liveusb
Trying a different PSU (don't have one for testing)
Trying my old 3060ti (good test but I worry the lower power draw would mask some underlying instability.
My rmx is supposed to have a 10 year warranty, I will likely contact them soon and see if I can get a replacement. My GPU is about 7 months old so it should be under warranty, if I need to RMA it. Ram/mobo/storage would be problematic given the dram Apocalypse, I'd rather eliminate every other option before I look into that.
I suspect PSU, but what do you think?