The 3090 takes up 3 slots but only has 4 ports. (Though I have noticed some of the third party cards seem to squeeze in a fifth). 2 FE 3080s would give you 8 ports. (I’m not confident I could squeeze two third party 3080s into my machine with their oversized fan cases...

Given the low stock available for the 30 cards, we probably will find out more about that 20gb version price before we can even buy a single 3080!

Thanks for the input!