I doubt it, but have those games always stuttered on your rig? I guess you've tryed the latest mobo/sound drivers for your board? I see you've got agp aperature set to 128mb, for optimal performance set to quarter or half of your system ram ie 256mb/512mb (can't see it making that much differerence though) If all else fails a reformat/fresh XP install solves most of my probs Don't forget BF2 is a biatch for stuttering when using less than 1.5 gig of system ram, and alot of peeps are complaing of the dreaded source stutter on both HL2 and DOD after the last steam update(prob be addressed with the next patch), as for NFSMW i was getting slight stuttering on a 512mb card with the demo, retail may differ?
GL