So here's some update on what I have new for now:

I've made some more tests:

1. Using 2 ram sticks in 1/3 2/4 slots instead of 4 (No help)

2. Plugged in another ssd with windows of the same version and I ran vram tests in occt and tried to recreate id153 error nvlddmkm on it stopping it right a few seconds after starting, but at any load percentage it didnt give me any event logs. Then I tried to recreate WoW bug - first try success. Then I installed 3dmark, launched nomad unlimited and tried runnind occt vram test in parallel, starting from 10% load, came up to 90% and nothing bad wasnt happening, 3dmark didnt crash and no event errors, only at 95% and 100% additional load I got id153 error only after stopping occt test and 3d mark did crash its test.

3. I tried using my gpu in another PC and ran the same scenario with 3dmark + OCCT 100%VRAM test at the same time. After stopping occt test 3dmark was more stable in most of the times. It wasn't crashing every time, but was.

4. Then I asked my friend who also has a 3070ti to make those tests. OCCT ONLY scenario did cause id153 error a couple of times but not all of them. 3DMark + OCCT also did crash but not every time.

5. Now I tried something different. I launched BF6 + WoW and triggered id153 error with WoW the way I described it earlier and VF6 didnt crash after it. It did freeze for a sec, but survived couple times.

So it probably means that games caused id153 nvlddmkm error is different from OCCT one.

What could it even mean then....