I have and love my old 2010 macbook. I recently upgraded the RAM to 8GB from 4GB. With 4GB the monitor app showed 3.36GB ram used but only 2.4GB in use by apps. with varying swap file Now have 8GB monitor app shows 5.36GB ram used with 4.11GB used by apps. but no swap file. Same apps open as usual here at work. Not causing a problem but why use more ram? it because with more ram it needs to empty it less often so appears to use more than before as more spare ram to play with. just curious. Machine running much smoother with 8gb and less pausing and beachballs than with 4gb not that had too many before but I am happier now how it runs.