I posted a random ghetto mod on my 3090FE in another post I made and thought people may be interested. Someone discussed deshrouding my 3090FE instead of water to help with noise levels, sadly that isn't really possible, but this gave me the idea of just strapping the Noctua fans I have to my GPU and making sure the air flowed in the same direction.
I made a bit of a hacky mod and attached the fans to the motherboard header and linked it to GPU temperature and maxed them out at around 1200RPM, then turned the FE fans down to 30%.
Temps have dropped drastically and the card is now sitting at around 60C under heavy load and the system is basically silent, not terrible for a couple of fans I had lying around anyway... Gives me chance to consider the watercooling properly and potentially a different case.