Hi people, I wonder if you could answer this question for me. I remember hearing a while ago that the 9400M in the Macbook uses 256mb of system RAM. But I also remember hearing that if you up your RAM to 4GB it doubles the amount of RAM the 9400M uses to 512mb. Or it could have been that if you only have 1GB system RAM the amount the 9400M takes up is halved to 128mb. Could anyone shed any light on this?