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[datacenter] real life power requirements

I am trying to budget power for a colo situation where we'll be locating a lot of gear. Most of it is Cisco stuff.
I tried to figure out a bit from Cisco's web site what the gear will
use. What I need to do is get within 5A, but since I pay for each 5A
increment, I don't want to have them put in more than I need.
So I'm looking for real world ideas of how to budget the power instead of
just going off the spec sheet. For example, a 7206VXR with dual AC
supplies (370W each) is rated to pull no more than 5A input current, but
summing that together is 10A or current. And I have a real hard time
believing that box will ever pull that much.
There must be some sensible derating factor/guesstimate to use knowing
things like I don't have the chassis full of cards, etc.
Any ideas?


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