I do not totally understand how much memory I have in my MacBook Pro. Below are my specs and could someone please explain what I have and how high I can go. I would like to install QuarkXpress 9 Thank you in advance. Model Name: MacBook Pro Model Identifier: MacBookPro5,4 Processor Name: Intel Core 2 Duo Processor Speed: 2.53 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Bus Speed: 1.07 GHz Boot ROM Version: MBP53.00AC.B03 SMC Version (system): 1.49f2 Oh by the way, I am blond!!!