I have 1100W
I do not have the consumption ratingsat hand but this information "that the tests done were only with the gpu at idle, and not full" is incorrect.
Most GPU tests I have seen provided information on power consumption at idle, middle and full usage so you should be able to find the numbers you need.
Somebody raised the same question like you in this forum:
http://www.tomshardware.com/forum/31...er-consumption
Anyway, this will solve all your questions:
eXtreme Power Supply Calculator Lite v2.5
http://www.extreme.outervision.com/p...ulatorlite.jsp
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thinking I may need two to really run this game well..
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I think you will probably not. For the low resolution you have, at the current state of the game (beta patch) I would hold on my money and wait for the next generation of NV cards.
~S~