Fit, but the power consumption at Zion is not really 65WIntel® Xeon® Processor 3065
The whole system will consume about 80W less, if not pathetic, that is normal.
(average electricity 230-250 rubles per month., if 24/7)
And, IMHO, better on the Atom's spin, they have only 10-15W consumption.
PS: IMHO the hard part SPRUT.io is the interface that runs on the client side, so that the Zion and the atom is more than enough.