Try a case swap which is painful or a new case and motherboard and swap over everything out of the current system. 
I just realized that the ROG Strix RTX 3090 that is arriving on Monday won’t fit in the case. I made this mistake due to Aurora R11 sold with the OEM RTX 3090. Now I know from other topics that those are OEM custom made cards. What options do I have? External gpu? Heavily modding case? Please help. 6 months of waiting for nothing. I’m quite depressed.
Aurora R9, ROG Strix RTX 3090