Power consumption of the new Xserve

When installing a server in a datacenter, the power usage is an important factor to take into account.
Apple has published the usage of the new Xserve in a technote.
It states that an Xserve mono 2.8 GHz, accompanied a 80 Gb HDD, 2 Gb RAM and a Radeon X1300 graphics card consumes maximum 247W, and 204W under low workload.
On the other hand, a machine equipped with 2 CPU's (8 cores at 3 GHz), 3x 300 Gb SAS 15000 rpm storage, 32 Gb RAM and the same Radeon X1300 consumes 409W when fully loaded, and 300W when 'idling'.
These numbers give us a pretty good thought about the power consumption of an equivalent Mac Pro,
knowing the 3.2GHz CPU's require 120W each, against 80W for the other models.