I am looking for info of what type of graphic card (AGP x8)will work on my Pc.It`s a Dell Optiplex Gx 270 P4 (Small desktop computer ) and it`s using the small profile graphic`s cards. Where can I buy one in the 256Mb/s range.The power supply is 210W.Operating system Win XP Pro.If I want to upgrade the power supply,any suggestions as to where I could also buy one if needed?