how do you determine

You look at the minimum required for your video card.
and multiply it by like uhm.
3.
4 if you want to be safe
=)
Or at least that's what I do, LOL :/


But really, just check out the minimum for your video card.
Then check out the min if you were planning on doing SLI.
Then get at least that...
Or go with like at least another 100w to be safe.
Depends on your budget ;p
 
There are a variety of online PSU calculators available on the Internet which can be helpful, and most video cards state a power recommendation as well. If you post your specs, we'll give you some recommendations.
 
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