asus prime x299 deluxe ii

My Zotac 2080ti Amp started smoking real bad and burn/caught on fire as shown. Any idea what could cause this?! I didn't have any game running at the time and I was just doing regular workstation work (3 displays). The Motherboard is an asus deluxe ii x299 motherboard. I'm running at 1500w gold PSU.

Got a fair idea of specs but which x299 motherboard would be best guys? ASUS Intel Core-X PRIME X299 DELUXE II ATX Motherboard or MSI MEG X299 CREATION I9 9900x Processor (Clocked up but only to fully safe with no destabilising or shortening of life) Be quiet Dark Rock PRO 4 250W...