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I've been using a 13" MBA as my main computer for the past year, and the 4GB max is really limiting for virtualization. The laptop can choke with with all of my usual tools open (Virtualbox/Photoshop/Chrome/Terminal).

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Yup, I know I can get away with 4GB if I'm careful because that's what my current 2007 MBP has. But will I still be able to use the Air for work when it's that old? I suspect 4GB will be comically small in 2015.

The modern SSDs in the new Airs makes a colossal difference when swapping. I've never had any problems with only having 4GB RAM on my previous gen 11" MBA, and I'm regularly running a host of apps and doing active app development with Xcode.

Swapping at 2-400MB/s is far less painful than swapping at ~15MB/s.

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