Currently Being ModeratedJan 24, 2013 7:52 AM (in response to 4thSpace)
8GB, to me, seems to be a 'sweet spot' for OS X Mountain Lion. I'm sure there are those who disagree and have opted for the max of 16GB. I use my Mac Mini as a home server and it only has the base 4GB. But it's not used for day to day activities like my MBP Retina.
It's odd that your MBP doesn't get up to 6G. Do you have the same amount of tabs open on it in Safari?
Currently Being ModeratedJan 24, 2013 3:32 PM (in response to 4thSpace)
video memory also comes out of your system ram I would suggest 16GB.
If the websites you visit have a lot of flash in them they can take a large amount of ram. There is a Safari plug-in called "ClickToFlash" which prevents the Flash plug-in from running un til you click the particular video or ad.
Freememory is also an App I use to well "free memory" & it shows available memory in the menu bar:Mac mini, OS X Mountain Lion (10.8.2), 2 GHz Quad-core i7 -Memory 16 GB