May have remembered my post here from two days ago, since then I've downgraded and then upgraded bios A82–>A81–>A82 (with multiple CMOS clears) to ensure a clean bios environment, reinstalled windows 25H2, uninstalled/reinstall x870 chipset drivers, now I'm starting ryzen3d tests for both stock EXPO1 and EXPO2.
Surprisingly, after the most clean environment my PC has seen in weeks, with nothing else changed in bios and only setting EXPO1, constant test 2 errors either within 2 minutes or 23 minutes.
Then I tried ryzen3d using EXPO2 which is 5600mhz 2000fclk, and it passed a full 3hrs of ryzen3d without error.
I've since upped vsoc from stock 1.20v to 1.25v to try and see if that'll help EXPO1 pass ryzen3d, but still more test 2 errors… is my CPU failing to cleanly run 6000mhz 2000fclk stock timings 1:1?
Not sure what to do next, I'll clear CMOS and attempt raising vsoc to 1.30v and see if that finally helps EXPO1 pass ryzen3d.. IDK.
EDIT1: 1.30v vsoc EXPO1, ryzen3d test 2 error within 3 minutes. Next up 1.4v VDD (VDDQ+VDDIO stock for now) & 1.25v vsoc
EDIT2: 1.25v vsoc EXPO1 VDD 1.4v, test 2 error in 6 minutes. Clearing CMOS and trying 1.25v vsoc and 1.4v VDD/VDDQ stock VDDIO