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This [1] is the closest thing I could quickly find, so I guess we are talking on the order of $250k to own one.

At this size calculating power consumption is probably important, it's definitely no longer insignificant

even at 1K per month it would add 36K doesn't change the equation much

That's 8 nodes with 1 CPU each.

There is one daughter board per socket but it is a single system.