I have been searching a lot and doing some reading to find out what to do to get better system performance. I bought my MacBook pro mid 2007 the configuration are 2.33GHZ, 2GB Ram. My system can only go up to 3GB Ram and has two slots to fill the ram. Currently, I have 1GB in each of them. Now the questions is 1. Should I put 1GB in one and 2GB in the other to make it 3GB total? 2. Should I put 2GB in each to make it 4GB total? I found out that matching pairs are good and if I put 4GB it will only use 3.2GB and the rest will be just unusable. If I put 3GB then it will not match but still gives you performance. I have read goods and bads for both and now highly confused what to do? I want to request my Mac users to please give me some suggestions, hints and better reasons to apply. I bought my system for $2700.00 when it first came out. Now do not think it is smart to sell it for $1200.00 (If I am lucky) and spend extra $600.00 to get 2.8GHz. I can afford both rams as they are really cheap now. I use my mac for surfing, movies both online and offline, some time PS and Aperture, I do tends to have about 10 different apps open at the same time, for example ( Skype, Safari, PS, MSN, Yahoo, Ichat, ITunes, etc). I am also thinking about playing some games on my Mac such as Call of Duty, Fall out 3 and stuff. thanks for reading and now waiting for your response.