The X3100 is an abomination for anything gaming. The 9400M is very much superior to the X3100 for gaming; definitely more robust.
Yup that line is the problem, the GMA cards are a pain when you need gaming performance. The good news is the newer MacBooks have a better 9400 card that allows you to play newer games like BioShock on medium settings.
Then again if you want to be gaming spending a little more money on a machine with a good card is worth it as it means you Mac will stay playable for that little bit longer. Although buying a MacPro is a little overkill
Edwin
Even with a macpro 4870 the graphics can get sluggish on high. Particularly when there are alot of players. Ive often wondered if i would have this problem if I purchased the windows version.
My list of servers is completely different than yours. Not sure why that would be. I cant find a hardcore match or a domination match on any of the servers that show up. In reality, there are only about 4-5 team deathmatches happening at any given time and a couple free for alls. Are you disabling your firewalls?
What will COD4 run like under OS X on my system?
Early 2008 Macbook Pro 15', 2.4 Ghz, 2GB RAM, nVidia Geforce 8600M GT 256 MB VRAM.
I can't decide whether to buy it or not.