doess the 256= 128 ram onboard..?? and what kinda ram sould i be looking to buy?? last but not least...i downloaded rtcw on this ibook..but turned down all settings.as i am not that bothered..as in terms of gfx..but am concerned about its shifty movement once alot happens on screen.. 1-is this the ram problem? 2-hdd not spinning fast enough? 3-gfx card onboard not good enough?