I been finding my 5090 FE pretty good, but one annoying thing about it is that when idle and you are web browsering etc.., basically not gaming, if the room is warm as the sun been hitting it for a few days and the fans keep ramping up to cool the card down then switches them off, then around 10mins or so, its repeat it all again.
The cooler is good as long as it’s got the fans spinning, but as soon as they stop there is not enough metal to dump the heat into before it hits over 50c for the fans to ramp up.
So far, the 5090 is good, but the drivers are trash, I am getting micro stutters on my 77” Samsung 95D that I play on downstairs, my 4090 had none at all, opened a thread on Nvidia forum as there are many with the same problem, so trying to get this fixed.
I would say overall the 4090 is more solid, the 5090 just feels a bit rough at the moment, but I know the 4090 was like that a little, just not as bad as this what I remember.