your situation is similar to mine,
i have MSI rs480M2 and recently bought 7300GT.
about two days ago i was playing games on x200, and then switched to 7300GT.
the difference is insane, u can't compare then.just running the system with this baby is different.
also, since i this is the first time i have bought a GFX card(previosuly intel810, the x200), i am quite comfortable running games at ultra low settings.at 640x480 reso.
however, 7300GT can run all of today's top of the line games without lowering down visual quality.games like NFS Carbon, splinter cell chaos theory, splinter cell double agent, oblivion, DMC can't run on x200, but they run at high settings on 7300GT!!!
on prob with x200 is it has pixel shaders 2.0, not vertex shaders 2.0. hence it causes certain slowdowns in games, when it should run them easily.