@Nathanpete I know loosing money sucks, but depending on how much I would be loosing, I would consider it if its done and working. No, I do not need more than 16 threads and the theretical IPC improvment will not do anything for me.
@jaslion There should not be, but there is. I have a ASUS ROG Maximus XI Extreme and an EVGA 3090 FTW3 Ultra. I am researching a lot and found a few forum posts (here and elsewhere) stating the same problem with ASUS MB and EVGA FTW3 Cards. Why this is... nobody knows, I think not even ASUS or EVGA know why or do not care, I dont know. I have talked to both supports and both where just like "RAM the hell out of those two products and eventually in a year or so it might work because of a lucky pick"...
But to answer your question: When I boot with the 3090 I eigther get a black screen when Windows is loading or a few seconds into Windows. When restarted the MB gets stuck on Error 97 and the debug screen shows "load vga bios" and thats it. Stuck there for eternity. Reboot, BIOS reset, BIOS update, CMOS clear with IO button, CMOS clear with removed BIOS battery, clean Windows install... all for nothing (I did the windows install on my old 1080Ti).