Upgrading my graphics card?

[plutomaniac]

Sorry for bumping, I didn't feel the need into making a new thread. Anyway, I found out that my motherboard doesn't support power supplies that are more then 450 watts. While searching the internet I read somewhere that I could put in another power supply that is under 450 watts and that would work. Would that really work, I really need this new graphics card.

That does not exist. Motherboards do not have power supply limitations. Even if you had a 20pin power supply it would work at a 24pin motherboard. And no you can't have 2 power supplies just like that.

For a GTX 660 and a non overclockable i7 you don't really need anything more than 550-600W as other said previously. When it comes to psu's prefer Corsair, Seasonic and Thermaltek. If you get one from these brands it should also have a good efficiency (80 or more).