Differential encoder hard crashes the PC MESA7i77

I am glad as i ran out of options a long time ago as most of it did not make sense!
What Asus?
If it has two or more sticks of RAM, yank one out and test, then yank the other and insert the first one, test again.

I did not say to switch slots, although that might help on old PC's or if the memory pins were touched during installation, i said to test each module, one at a time, and that is still valid advice, had new 16GB module fail inside a week lately, out of 6 modules one failed, and the PC will boot with it and work till starting new apps does not work anymore and the PC reboots on it's own.
Sent it back for replacement, got it back with the note "it works fine", now i have to call tomorrow (well today as it is 5:15AM here) and explain to them that booting windows does not work as a memory test.
I did test it, on 4 motherboards, on 3 it works and memory test fails miserably, on one board it will not boot at all, even after BIOS reset and XMP/EXPO disabled.
The other things that might cause such issues, power supply (hard to check without replacing, needs a scope), and in your case might also be the motherboard as A520 are the low tier for AMD, so signal integrity for the memory controller might be compromised, although AMD is pretty damn good at fixing errors.
But first, disable XMP/EXPO in BIOS and test.