Switching to ARM might be a bigger efficiency gain, but nobody wants arm. Azure already offers ARM servers. Moreover, these aren't exclusive - one can easily si

Switching to ARM might be a bigger efficiency gain, but nobody wants arm. Azure already offers ARM servers. Moreover, these aren't exclusive - one can easily sink an ARM server just as easily as you can sink an Intel one. But the efficiency gains are such: Air conditioning is actually inefficient, especially with air cooling. Water cooling is more efficient. Water cooling traditionally uses water as an exchange medium, but is eventually water-cooled-by-air anyway, just in bigger batches. Here, they can take in new cold water and throw out old hot water without actually bothering with any air exchange at all. Or at least, that's the plan. Maybe it'll work! (If "nobody cares because energy is cheap", we wouldn't have tried this in the first place.)