i think 3-slot is a hard stop for nvidia, beyond that we are looking at a liquid cooled FE
As it should be. The current cooler already invalidates your next PCI-E slot on most motherboards, and I've not once noticed this 4090FE cooler even remotely struggle to cool the card, even with 2 of them next to one another! Probably could have got away with something more like the 3090FE size tbh.