"The ability to use DC as well as AC power supplies ... the DC power supply can take 48 volt or 60 volt power, while the AC unit can scale from 100 volts to 240 volts.
Ok. Why don't "commodity" servers have that kind of extra option? Do only telecom-historical racks have DC? Doesn't DC reduce hardware bolt-ons? Or does it INCREASE hardware bolt-ons?
"if you want redundancy. The DC supplies cost a couple grand extra."
Why so expensive?
"In this case a maximum of two 1,200 watters"
Can one actually put more than a couple of those machines in the same rack without blowing the room's breakers? I can't imagine. The cooling effort must be tremendous, too.