help I dont know what kind of standard atx power supply I need...?

Question

the rating that it says that I need for my new graphics card states
A minimum 400W system power supply (with 12V current rating of 20A or more)
what does the 12v current rating of 20a or more mean? and should I even worry about it?

Answer 1

This may help you. I would want at least 500 watts. But, read the article.
http://www.motherboards.org/articles/guides/1487_1.html

Answer 2

chyeck these links hope it will help