power supply should be good enough. you still gotta troubleshoot tho. run the ram without xmp or lower the frequency and test stability. check all connections if they are seated properly. includes ram sticks.
not sure how much the resolution influences stability. do you run out of vram? would not explain freezing tho. hmm…
i’ve got no opinion on substrate, currently. the demo map ran like crap on my (3060) laptop. should not freeze either tho. more or less just render slower.