[Zenst]

Total, more the company inhouse data center type affairs - big, but not your cloud or google size affairs. Then doing one AC to DC conversion instead of all that overhead per system along with the associated heat and centralising - pays for itself.

The cut-off for that level of work I'd say is if you design your own servers over just speccing from a vendor level is when you would be doing this. Upto that, it's still vendor off shelf. Though been a while and an option some vendors may now offer at lower scales these days.