Hey everyone this is my first post here but this place is great, I've gotten help by reading these forums many times before.
The problem I've been having with my computer started three or so months back, it seemed to go away for weeks at a time, but now it's really bugging me since it's preventing me from playing any games and the instability can cause work loss.
I get some random and some crashes where I can reliably expect them both when stressed and when not stressed. I've reformatted windows, tried different drivers, used different memory slots and speeds, and unplugged all unnecessary peripherals (only mouse,keyboard,dp-video,power). Took a day and ran memtest86 on all modules one at a time in slot a2 at 3200mhz with no errors on any module. I repeated the test in dual channel with slots a2 and b2 with no errors as well. The problems start when testing any combination involving slots a1 and b1 with errors showing up right away at 2800mhz and higher. The only other parts I can potentially test are another GPU (R9 270) and a different PSU (500W) although since those parts are so different I'm not sure testing with them will help.
The problems manifested in either random blue screens (PAGE_FAULT_IN_NONPAGED_AREA, SYSTEM_SERVICE_EXCEPTION, and nvidia driver error one time) or black screens where video just cuts out but the computer is still on with audio playback, hardware lights and fans spinning (gpu spins full speed).
I logged everything using hwinfo64 when I expected a crash during a stress test (heaven benchmark reliably causes black screen < 2min) and I saw that the pci-e slot seems to stop working or something (showing 0x pci-e speed). I already RMA'd my first GPU due to artifacting thinking it was failing but there was no improvement, in fact I think it got worse. The memory failures even though each module is individually good combined with the GPU slot issues makes me think the problem is the motherboard, but a few other possibilities are bouncing around and just wondering what kind of ideas you all might have. Any help figuring out what it is that I should send in next is greatly appreciated.
system info:
Asrock B450M Pro4
AMD Ryzen 5 2600 @ stock speed
Team Group 32GB (4 x 8GB) DDR4 3200mhz, B-Die (tested @ 2400mhz w/crashing also)
EVGA GTX 1080 FTW 8GB
Windows 10 Pro
Samsung 970 Pro M.2 (os ssd)
EVGA 750W P2