Well you'd definitely notice a difference between your 1800+ and a 2800+, but you should be fine. Whatever your old video card was, you'll definitely notice a difference in your 9700 pro. I could easily tell the difference when I upgraded from my old Radeon 8500 64MB to my 9700 Pro, when I was using my Athlon XP 1900+. However, I'm now using the Tbred B 2100+ @ 2300 MHz and my FPS is insane in any game, even with AA/AF and the game settings turned up.