Graphics Cards

[Kreekakon]

For the watt number I think you'll have to open your computer...

Here are some links to help you ^^
http://www.ehow.com/how_5004614_check-po...ttage.html
http://www.computerhope.com/issues/ch000800.htm

EDIT:

Ya I assumed I would have to call someone to help me out with this, haha. Though I'm starting to think my computer is too much of a piece of junk for any top-tier graphics cards like the nVidia GTX 660. Are there any other ways I can make sure it's compatible with my PC?

Actually as long as your computer fulfills the two requirements I posted above, it doesn't matter how junky your computer is. You can very much have a crap computer with an awesome graphics card installed, although it wouldn't do you too much good since the CPU, and such would still be running slower than the graphics card resulting in software not being able to make all that processing power apparent anyways.