Greetings It's been a while since my last post!

After rediscovering my passion for GTA, I'm looking to replace my 9800 Pro AGP 128MB with something a bit more powerful to run the game. I can get a sweet deal on a Sapphire X1650 Pro 512MB, so I've been reading up (reading up on hardware is something I haven't done in a long time...) and I'm afraid that the performance gain isn't noticeable. Can anyone give me some input on this?