Known by who ?
I have 2 x 3090 Palit Gamerocks in Nvlink/SLI both on the OC profile BIOS switch and they don't run hot and actually run a lot cooler than the 2 x 3090FE I had in as a test before and why I went with AIB 3 fan cards instead.
Comes down to poor airflow in the case or poor case for the card or placement if using risers or vertical mounting. My experience so far with Palit has been excellent.
As can be seen here :-
my 3090 strix had zero whine until i put an EKWB water block on it, now its super loud like you describe Can be: previous thermalpad would be right on the spot applying some pressure and acting as a dampener or the fans were masking the coil whine. Mine happens on Assassin's creed, not a lot...
forums.overclockers.co.uk
Even with a sound card sat vertically next to them. They haven't missed a beat or ever throttled or got to silly temps even in summer.
But as stated temps for 30 series are warmer and that is down to the nvidia's boost feature pushing cards as fast as they will go in their safe limits and also 30 series used more more than previous generations of gpus, so more power more heat too and also 30 series have better coolers too so counters the temp issues on well designed gpu coolers. Basically if the card doesn't throttle in normal use then all is fine, if it does maybe check airflow in the case and if that looks right try card outside of case and if it is still an issue it may mean the card needs new thermal paste/pads if everything was at stock settings for the card and no oc applied or manual fan curves.