In the past when I owned a laptop with a integrated GPU that shared system RAM, you were able to adjust the available RAM for the GPU to utilize. I noticed on Apple's site, it says 256mb is the minimum the 320M uses, but it doesn't mention anything about a maximum, or if they even allow the user to change the amount of RAM used. My last laptop used a Radeon HD 3200, which could share up to 512mb of system RAM. Going from the stock settings of 256mb shared to 512mb made quite a performance boost, so I am hoping there are similar options for the 320M. (Notebook check says nothing about it's maximum amount of RAM) This question might be better asked on the Macbook Pro forums but maybe someone here will know. Appreciate your time.