I am having a difficult time finding out if this is possible. I want to put 4 GB RAM 2 x 2 GB modules in a v 1,1 MBP with a 2 GHz Core Duo CPU. I really thought 4 GB was possible? However, Mac Sales only list 2 GB as the maximum. I wasn't aware of this limitation? I had a C2D version MBP that had 4 GB RAM, so maybe that is the difference? I did look for this information elsewhere, and all I see is 2 GB maximum, but I am praying to be able to install more??? Anyone confirm one way or another? Can I put 2 x 2 GB 667 MHz DDR2 RAM in a v 1,1 MBP with 2 GHz Core Duo CPU and 128 MB VRAM ATI x1600?