I have had this system for a little over a year now. It has served me well. Unfortunately I have been encountering an inconvenient problem of running out of memory and thus having to use my SSD (the hard drive) for swap... I would really like to avoid unnecessary writes if I can avoid it). Picked up Starcraft 2 the other day, runs great on the gaming PC but when I'm not there it still runs great on this laptop . Except for the part that after awhile it ends up using close to 2GB of ram JUST for the game.... the system ends up using almost all of the other remaining 2GB... resulting in swap usage. I think its time I look into bumping the memory up to 8GB. Here is my system: Macbook Pro 15.4" 2.66ghz (core 2 duo). Purchased in April 2009 (before they came out with the ones with the polymer battery). This is the memory I am looking at grabbing: http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231295 I am fairly confident that it would work. I know the memory in my macbook pro is: DDR3 PC3 8500 (1066 mhz) The one I am thinking of grabbing is: DDR3 PC3 10666 (1333 mhz) Obviously it would not run at 1333 mhz in my system, it would be clocked down to 1066. The only reason I am thinking of grabbing that ram is down the road (when the macbook pro's eventually come with 1333mhz ram, I will already be set for 8GB). The questions I have are: 1. For those that have the macbook pro 5, 1 (the 15" 2.66ghz one), have you upgaded to 8gb of ram successfully? 2. I think thats a good price... thoughts? Thanks!