Hi - I recently found out that the early-2008 MBP will (unofficially) actually take up to 6GB RAM using one 4GB module and one 2GB module. I currently have 4GM RAM (2 x 2GB DDR2 667Ghz modules), but do a lot go memory-intensive stuff (editing very large image files in Photoshop, running Virtual Machines etc., running games like Dragon Age Origins etc.), so would like to try out expanding the RAM and have just bought a single 4GB DDR2 667Ghz module (from Crucial, which is where I got the 2GB modules from, so should hopefully be compatible) What I'm not sure about is whether this will only work properly if I install the 4GB module in a specific memory slot? I'm guessing the first slot would make the most sense, but I'm not sure. Has anyone tried this? Thanks If it doesn't work, I can apparently still return the RAM to the supplier.