Doubling the PDUs seems shockingly wasteful as apposed to just reducing equipment per rack slightly, there's no way you can consistently cool 30KW/rack with air

Doubling the PDUs seems shockingly wasteful as apposed to just reducing equipment per rack slightly, there's no way you can consistently cool 30KW/rack with air (well, OK, you could but it's much more inefficient or would require RDHX). Best case you're looking at about 20KW, so they've doubled the power infra to deliver up to 30% more power? Lower rack densities are also more efficient overall (down to about 6KW/Rack where they start getting more in-efficient again) as you're able to move air more slowly over the severs, it's much better for example to have two racks of 20X2U 500W servers than one rack of 40X1U 500W servers, as you can use bigger fans in the servers which are more efficient, and handle air in the room more easily.