My 14 year old son loves to play Halo. The problem is he prefers to play on my white 2.2 MacBook on the 20" ACDas it is faster than his windoze laptop. He does complain of lag on the MB. The white MacBook is 2.2 with 320gb WD HDD and 4gb ram. Today my refurb MBP 2.4 with nvidia 256mb graphics card, 2gb ram and 160gb HDD came today (love it). So..................today I hooked the MBP up to the ACD and said "go play". He looked at me gobsmacked as I usually nag him to come off it !!! He did not notice the MBP and said he noticed no difference in performance whilst playing the game I was not expecting that !!!!