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?
With the right firmware update, they can take up to 8GB. Just update all the way man and go for 8GB.