Hello, i have a 250 watt psu and im gonna buy one of these cards soon: HD4830 512mb HD5670 512mb 9800GT 512mb 9600GT 512mb i wanna know which is the best will my psu run it. my native resolution 1440x900. i will be using it for purely gaming.
Get an HD5670. It uses less power than any of the above cards, and will run just fine.
I hate to be the bearer of bad news, but unless you have a top of the line HQ PSU, it is doubtful it will run any of those reliably.