You got a good one, run it and enjoy.
Unfortunately they are not all the same.
Okday, maybe have 3 x 120mm Fans blowing air into the case and have 1x 120mm fan exhausting air out of the case on the back of the case, that might help. Also, many of my builds use water cooled CPUs so the CPU does not exhaust hot air into the case that helps keep temps down during gaming. like the one below:
https://www.overclockers.co.uk/nzxt-kraken-x73-rgb-aio-cpu-water-cooler-360mm-hs-01s-nx.html
And yes I'm fully aware changing the pads lowers temps.... But isn't that why this is a hobby?
The real impact here is when miners attempt to liquidate their GPUs. People start getting the problems.
I have been using my 3090 for both mining and gaming and it has lost 0% performance in the 10 months I've had it , in fact if anything it seem to have gained performance as i am either beating or matching my benchmark scores from when i 1st got the card. If mining really did kill them then i simply would not be beating my old scores and you would assume a degradation in performance but that is not the case . If you are not mining on your 3090 no problem but mine has paid for itself already and almost have enough to buy a second if i wanted..