If it gets chuggy (stuttering), it will almost have something to do with your HD or video card, krypto. I was unable to play Fallout 3 on my laptop until I upgraded the HD. But I'm surprised. It runs a lot smoother than Fallout 3 did for me. Its clear they have upgraded the engine, but then again the textures are also rendering a lot clearer. Have you tried turning off HDR and anti-aliasing in the options? Perhaps lower the res. If you still get a stutter it may be the HD. This game will use a lot of disk I/O as something is constantly going on. If it can run on a P4 as TorrentG says I would really check this out.