I would imagine the biggest hit is B. If you're developing search functionality or other features that work against the social graph then you'll probably need t

I would imagine the biggest hit is B. If you're developing search functionality or other features that work against the social graph then you'll probably need to get a large chunk of that into memory. I've worked on a couple of non-trivial web apps, but nothing even close to linked in and 4gb was a necessity at times.