Graphics - Power supply?

I have Windows Vista currently - Im looking at purchasing a
GeForce 8800GTS (320MB version). My 1st question is where can i look to fnd out what power supply i have... 2nd is it likely that i will have to buy a new one if i bought this Graphics card even thought thpc was brand new 3 months ago. thanks all.

Answers:
Make sure it fits. The 8800 dont fit in dimensions 520 or 521, you didnt say what computer.
There is no substitute for opening the case and reading the label. It will tell you all that you need to know.

As for whether you will need a new one - impossible to tell without knowing what you have!
Bah, most new vista power supplies are around 450-500watts, you probably wont need a new power supply, the only way i can think of to see the type of power supply is to take off the side panel and look at the power supply, its probably somewhere on the side... you'll find the watts, you really only need a 400watt power supply... but if you find to need a new one, this is what i suggest...

http://www.newegg.com/product/product.as...

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