I planned on water cooling but I never made it that far. They were FE cards. I do miss blower style but I understand they're hitting limits with it.
Interesting that FEs are working, I had heard that that configuration was problematic. Have you seen much thermal throttling with them butting up against each other? I was going to resign myself to one blower 1080Ti in slot 1 and then a 2080Ti in 2 and 4, but maybe I don't have to :-)