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How to choose a UPS / calculate power for a new PC

It seems to be a common question here, but I want to know, based on a configuration (processor, used memory modules, video chip, number of fans, etc), which is the better power supply to fulfill an specific need. Is there any calculation I can do for knowing that?

The popular knowledge just says to use certain power supply wattages deppending of your user profile ( heavy user -> 500w, heavy gamer -> 700w, etc), and I think this is very inaccurate.

By the way, my second question is, yes, a recommendation. I recently bought a Intel i7, a 2TB commom HD, a single 4gb module (planing to upgrade to 4x4gb), a GeForce GT210 512mb, with 2 extra fans and a 500w power supply weren't sufficient (The PC was shutting down seconds after it was powered on, and shutting down again(eternal loop) - I think this is a power supply issue). And I will first know how many watts I need to serve my configuration before trying another one.

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marked as duplicate by Simon Sheehan, Diago Oct 20 '11 at 20:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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One of our very own Super Users, Berk98, has written a very detailed blog post on how to select the right PSU. You can find it on our own blog! - 5 Ways of Finding the Right Power Supply.

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Thanks Simon! Now I see that I didn't found any duplicate of my question because I used the wrong terms. Sorry! –  Marcelo Assis Oct 20 '11 at 20:42
    
@MarcelodeAssis its all good! Glad we got your question resolved! –  Simon Sheehan Oct 20 '11 at 22:03
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