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I just had open more than 20 apps (iTunes, iMovie, iPhoto, Pages, Keynote, Safari and Chrome with a lot of tabs open, GameCentre...that kind of thing) and I was using 5.5Gb. So that is another 2.5Gb of RAM I could use before it would then throw out all App Cache (which was 1Gb), then that is another 1Gb before the system would then start to compress RAM, where I would then have 4Gb before I started to Swap heavily to HDD. That totals up to me using around 40% of RAM (with 100% representing the point in which Swap takes place). Seeing as I usually only have one Application open at a time, 8Gb of RAM is more than enough for me, and I plan to keep my iMac for at least 5 years before I would buy another one (and I would not sell it, I'd keep it as a second monitor, or even just sit it somewhere nice) so resale never meant nothing to me either.

I can't say to what would suit you better, but hopefully my decision will help you with your own :) If your like me, 8Gb is great! If you are running VM's though, go for 16Gb.
 
Never used 16gb RAM but I have 8gb RAM in my rMBP late 2013 13", this thing is super fast and I can play games and edit video without a hiccup.
 
mmm good point

Hello,
I've just sold few month ago a mid-2010 MBP 950$ at the time I was telling my self 4go was enough... Finaly I did upgrade to 8go, the moment I put it on Kijiji here in canada i've sold it in 48 hours the fact I had more ram made the sell faster then I expect...
Thank
 
What I've always wanted to know is whether ram is more important than storage in terms of Mac (being soldered on an all ;) )
 
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