Need For Speed Rivals! test (Geforce 9600GT ,e4500) playable but lag lots!

Need For Speed Rivals! 1-Minute gameplay test (Geforce 9600GT C2D E4500) playable but lags lot! E4500 C2D @ 2.6Ghz MSi P45 Neo-3 Motherboard 4GB DDR2 Kingston HyperX MSi nVidia Geforce 9600GT 512MB SB Audigy 2 Zs Windows 7 Ultimate Specs - http://oi44.tinypic.com/2wgd66w.jpg