Physical questions

[Michael Stein]

> High density clusters also carry a fire risk of their very own.  One can
> easily achieve node densities that consume 2 or 3 thousand watts in a
> rack (and with effort, can maybe double that).

I've seen a dual 2.4 GHz Xeon Intel 1U machine measured at 250 W (multiple
"burn*" running).  A rack full of these (42 U) really is 10KW.
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