Will the Radeon HD 6670 work with my inspiron 580?

[candylinjack]

I was planning on buying this card so my computer can finally play GTA 4. This is the card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102988

I wanna know if this would fit my computer, oh and here are my specs

http://www.dell.com/support/Manuals/us/en/19/product/inspiron-580
(click Comprehensive Specifications)

Apparently it says my computer has 300 watts, but this graphics card has a minimum of 400 watts, would it still work? Because i read online that this card will fit.
Thank you

 

[Dark Lord of Tech]

It will run on it.