Jim Manley said:
500 and 700 ma are the maximum current ratings for the A and B boards, not minimum draw, which is 200 ma AIUI.
Exactly, and when you design your power supply it MUST be able to cope with the maximum peaks that the system could possibly draw, otherwise you get catastrophic results.
In general, designing for the max current is definitely advisable. Some of us will be running R-Pi boards in headless mode (e.g., SSH/VNC in via network, no video out, no keyboard/mouse, etc.), so, we can design for lower supply current, which will be important for parallel-processing Brambles of large numbers of R-Pi boards.
The best things in life aren't things ... but, a Pi comes pretty darned close!
"Education is not the filling of a pail, but the lighting of a fire." -- W.B. Yeats
In theory, theory & practice are the same - in practice, they aren't!!!