so I have an older e machine gamer pc and my dad found an adapter , something like this http://www.techpowerup.com/?3272 and we got a gtx 580, I have another agp slot, so I was thinking of getting another gtx 580, but before I spend that much, I am wondering if a bigger amp like 1000 watts will give me the fps im looking for , I get 28-31 fps's on high right now at 1366x768, my amp I have now is a 550 we got when the old when went out . my other specs are 1024 gigabite rams, 250 gigabites hard drives, AMD 2800+ stock motherboard 1 dvd rom and 1 floppy rom, thanks