FWIW there are strong and persistent report that OSX's memory management has finally stopped sucking in Mavericks, on top of the memory compression feature. A few people have reported significant improvements in "free" memory, and much more limited swapping due to e.g. the file cache being garbage[0]. So 4GB might be enough under Mavericks (BD obviously).
The reason they do it is "free money" though, especially since memory is soldered.
The reason they do it is "free money" though, especially since memory is soldered.
[0] http://www.reddit.com/r/osx/comments/1ov3jy/i_am_incredibly_...