I'm using a MacBookPro3,1 and am aware that it has a 64 bit processor. I currently have the stock 2GB of RAM in my book, and I was wondering if it is feasible for me to upgrade my book to have more - and would I really get benefits? Possibly a stupid question, but I am not really used to messing around with my MacBook. Will it be able to use all the extra memory? Will it take full advantage of the 64 bit? EDIT:: Just wanted to add the reason I am posting is that I am still somewhat confused by the above posted link about RAM.