Friend that is cruel reality. Your graphic card is fault. I know that, you know that, all advanced users know that here.
That's problem you are in moment where 99% of chance is that problem cause ASUS hardware. Because of that you will not get more answers or help.
Today no such brand who produce low percent of fault units...With every brand I always leave possibility that something maybe not work. Because of that I didn't bought R5E from Hungary for 390e, I payed 460-470e in Belgrade. Because It's much easier with ASUS distributor near me. I could saved lot, but't that's not memory, SSD, cooler, graphic card, on motherboard many things could go wrong.
After production cross in China all of us are victims and we can't do nothing to change that... But we can do something else. Before upgrade we can choose someone who react instantly if problem show up, not someone to back you fault hardware. I have no such problem to bring two PC in store and show them what is problem and ask them to try in front of me in their PC to show me how that work if they say it's fixed.
I advice you to nice explain problem on paper to ask RMA again. Explain them over phone or e-mail or personally or write on paper that they didn't do nothing, they back you hardware in same fault condition and if you bought in some local store ask them to try in front of you in their working PC, if they think that something else is wrong with you. If problem gone and you see graphic work normal with own eyes than you need to deal with problem on different way... If card start to behave same, crash with DX message they can't do nothing else than to try other sample in front of you and replace your card.
I talk about this with possibility that you tried everything and that really no other solution after Windows reinstall, DX update, Microsoft Visual C++ installation, NET Framework all version and updates, good PSU, normal temps, fabric clock, different drivers and if other graphic card work in your PC normal.