Upgrading your card won't necessarily improve the performance. You said you have a 4x AGP slot, which is the older, slower type of slot. Most modern cards now use AGP 8x. They would still work in a 4x, but it wouldn't perform as good in a 4x AGP, as in an AGP 8x slot. You didn't mention whether your AMD CPU was a Duron or Athlon? Anyway, if you are really looking for the ability to play the latest games, it may be an idea to change your mainboard for one with an 8x AGP slot. If you search for the correct board, everything else in your PC, should still work (your cpu, memory, hard drive, etc). Hope I have been of some help.