this is why the DC powered servers in the open compute platform design rack are all fed from something like 277VAC (or even 480VAC) to a centralized power suppl

this is why the DC powered servers in the open compute platform design rack are all fed from something like 277VAC (or even 480VAC) to a centralized power supply in the rack, which creates 48VDC, and is then fed from the center of the rack to a bunch of 1U sized servers. any particular 48vdc cable set of conductors is not longer than about 160 cm. individual servers then have 48vdc-to-12vdc high efficiency power supplies to create power usable by their motherboards. of course you don't want to run cables for 12vdc around anywhere. https://www.google.com/search?client=firefox-b-d&q=open+compute+platform+48v https://www.google.com/search?client=firefox-b-d&q=open+comp...