Check this out, https://imgur.com/RcE5tlh, this puppy is freon cooled to be able to go to 5Ghz
They also had the 28 core Cascade Lake on the showroom floor with their partners with normal water blocks.
https://videocardz.com/newz/asus-dominus-spotted-with-28-cor...
Air cooling is however quite likely out of the question if you want to keep your hearing.
I think air cooling is 100% out. Using the current generation LFA3647 Xeons, you pretty much need dual 8180 kind of setup to get Cinebench score of around 7500, that is 410w TDP for two processors. With the same 14nm, squeezing such computing power into a single chip is not going to lower the TDP. We are about to see the hottest (300-400W) Intel processor ever released.