Wow, in PES is just catch the ball and run like a crazy. It's really sucks, looks like american football. It's terrible compared to incredible level of simulation in FIFA 11.
Don't say things like that, mate
PES11 is a good game, unlike PES10, but FIFA11 is a real simulation.
You guys don't read nothing anymore, ins't?
FIFA 11 have a problem with
Vsync. Turn off (terrible tearing, instead) or turn the
Triple Buffering ON in your Control Panel (CP nVidia or ATi Catalyst). If doesn't exist this option in CP, download Rivaturner and put this ON.
Also if you turn on MSAA in level 2 or 4 your performance is look like crap. Your system is a good system, but don't think you can turn on MSAA of the game.
Try turno the AA of your control panel too. Like a 2XAA, it's very different to the heavy MultiSampling Antialiasing (MSAA).
FIFA 11 is not a light game. So if you do not have at least a GTS250 or HD4850 don't even think in enable AA in game options.