Yepp, Hungarian is the system lang, I was aftraid that you won't be able to read it. I attached the evtx files you requested. Thanks for your effort!
I managed to set memory voltage to 1.64v, it did not help. I checked the newer RAM pairs separately, I still got the problem, so if this is a memory problem, then either the older ones are okay and the newer ones not or none of these old modules are okay. I'll check the system with the older modules too, but I think this is not a memory issue. I asked this on another forum, somebody told me, that this can be a hardware problem with the PCIE slot, so I probably won't be able to fix it. I cleaned the slot with acetone, it did not help. I'll get back my old video card for a day, so I will be able to check the system with that too. I hope it will work with that card and I will be able to sell it and forget these parts for eternity. I'll check the video card with the new parts further, maybe it has the hardware problem and not the old mobo. If so I can still send it back, I have 3 years warranty. Another possible suspect is the PSU, but the voltages appear to be okay. So I did not have much progress, still every part passes every test and benchmark, and still the game crashes after 2-3 hours.