I have a late 2008 MacBook (one of the unibody ones) running 10.6 in 32bit mode. It has 2Gb of RAM and the Crucial scanner (http://www.crucial.com/mac/) says it can accept 4Gb. I imagine I'd have to buy 4Gb rather than an additional 2Gb (right?), that's priced about $35US. I was wondering if I'm likely to notice the benefit? Anyone done similar things on older MacBooks?