i have a old dell optiplex gx270 with the origional mother board and i wanted to know idk i could put a newer geforce 6200 whi

[TK RYUvsKENNY]

I know my setup is very old but im not trying to play new games and i just dont have the money for a computer right now

 

[Petrossa]

As long as that GeForce 6200 is an AGP card, there's no reason you cannot slot one into that system.
Just be sure that it is a low profile card so that it will fit into that chassis, unless you have the normal and not SFF case.