I have a 17" Rev C MacBook Pro. According to the intarwebz, my model should only recognize up to 3GB of RAM. I just bought two 2GB sticks to total 4GB of RAM. I did this simply for the "matched pair" "benefits" and only expected 3 to be used. Well I turned on the computer, went to About This Mac, and was surprised to find that it recognized all 4GB. Does this mean all four are in use? Or does it only use three, even though it knows it has four (lame)? All I know is that Safari seems snappier.