It depends on your game. If u play games that are GPU-demanded like Crysis Series or Battlefield Series, your CPU wouldn't be a problem at all. But if your games are CPU or both CPU/GPU demanded, like the Far Cry or the coming GTA 5, I don't think your CPU could handle it, unless u change your CPU or try to overclock it to say 4.0Ghz or higher.(Don't know if your coller could handle it)
Or, since your CPU is an AM3 type, u may better get a new Athlon X4 CPU (there is one which is on sale in newegg.com priced $79). I always appreciate an entry quad-core CPU plus a mid-high GPU (like HD 7850/HD 6850 or GTX 560/GTX 660).