That may be the case indeed. However, the GPU dip in not using matched pairs is very minor.Apple say it maxes at 2gb not 3gb.
This is because they want you to have matched RAM to help out the GPU, and they don't want to advocate 4GB because the computer will only use 3.3GB
You can mix and match sticks, but from what you say you use your machine for I would recommend 2x1GB sticks as that would give you optimal perfomance.iam a noob at this what type of ram does the macbook support and can i get one 2 gb stick anda 1 gig or 512? and i use the pc for music light gaming(WOW,CS) and movies sometimes photos.