It seems that a fair number of EVGA RTX 3090 FTW3 cards are faulty. I have seen many threads on the EVGA forum and the fingers point to the FTW3 models. Concerns over the scratches on the back plate along with smells suggests some cards are severely damaged. The post suggest the card was used for mining without taking some defensive steps.
One person was on a third RMA suggesting that there are issues. The AX1600i in the studio can handle any card. With 10 connectors there no concern about powering a video card.
Larger cards are a tad unwieldy in most chassis. This is due to the 12.6″ length. Some are now using a support device to keep heavy triple fan video cards secure. So far with longer cards the bracket and slot are quite capable of the weight of the Sapphire Nitro R9 Fury which is now obsolete.
Since the R9 Fury came to market, a few extreme cards started becoming more common when RTX Turning came to market. The when RTX Ampere came to market the move to extreme cooling moved into lower SKU ranges.
The issues suggest it’s wise to avoid the EVGA RTX 3080 FTW3 due to the problems. I am aware that many RTX 3090 cards are being used for mining and such cards are baking the GDDR6X memory leading to a very short service life. The applies to the RTX 3080 cards which are also problematic. Mining with the RTX 3060 however is much less problematic so leaving RTX 3080 and RTX 3090 to gaming which is what these cards are designed for.