Space is not tight. Computer room is quite spacious but air conditioning is
rudimental, no windows or water lines to dump the heat. It looks like a big
if space is not a big deal, why are you even thinking about rack-mount?
I'd recommend looking at the Intel Twin motherboard systems for this
nothing special about Intel twins afaik - AMD twins are comparable.
but it seems even sillier to go with twin systems since you say space
is not tight, and you'd be just creating a hotter hot-spot to cool.
(ultimately, of course, 40 nodes dissipate about the same amount
regardless of formfactor, and you need to find out whether your room
can extract around 40*400W, about 5 tons of cooling. and supply
that 16 kw, of course. I haven't measured many dual-quads yet -
the dissipation might be closer to 300W.)
the very maximum. The Intel twins help here again, as they have a high
efficiency PSU and the losses are shared between two systems. I'm not
afaik, their efficiency is maybe 10% better than more routine hardware.
doesn't really change the big picture. and high-eff PSU's are available
in pretty much any form-factor. choosing lower-power processors (and perhaps
avoiding fbdimms) will probably save more power than perseverating too much
on the PSU...
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