I have a new 2011 MBP with 4 gb ram. Under normal use, I'm looking at 2gb written compared to 900 mb read (after 3 hours use). It only shows 1.5 gb of ram used (.5 gb is inactive). Should I get more ram? I'm getting an SSD to put in it. Last night, I had the computer on for 3 days straight, it showed 16gb written compared to 2gb read. What's up with this? I'm guessing I should get 8gb ram since I will have an SSD, in order to reduce the # of writes.