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See if you can boot this from USB: Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums
As PE runs from RAM if it still crashes after a couple of minutes you can rule out your disk being the problem as the disk isn't used.
You can download and run pretty much most portable apps from PE but see if it works first. If it boots to its desktop but crashes after a couple of minutes then it is either your RAM (that you already tested), your logic board or some other part of hardware. If it keeps on working most likely it is your disk or windows installation.
As it loads the whole image to RAM let it run a few minutes before deciding it doesn't work as reading from USB can be slow. It takes me 2 or 3 minutes to get to the rescue disk desktop on my old systems.