Hello, i have a hp compaq 6005 pro sff minitower and i wud like to upgrade my gpu nd psu. The problem is that i have no idea what psu nd gpu to take as i dnt no much bout pc's. I have an amd athlon ii b26 cpu which pushes out 3.2 ghz nd 2gig of ram my onboard graphics is ati radeon hd 4200 but dnt think thats gud enuf for modern games. My os is windows 7 32 bit, Can any1 help plz.