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In particular, Mac OS X don't even run well with only 4GB of RAM anymore, and older machines use DDR2 where 4GB SO-DIMMs (and any other sticks based on 2Gbit DDR2) are rare and expensive. I wonder what is the current status of this bug BTW: http://apple.stackexchange.com/questions/42426/can-i-upgrade...

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I've upgraded 4GB 2007 iMac to Mavericks and it worked very well (for its age).

Mavericks introduced RAM compression, so for RAM-constrained machines it may be even better than the previous OS.

> In particular, Mac OS X don't even run well with only 4GB of RAM anymore

It actually runs great. I'm using a 2011 Air w/2GB (cheapest back then) and El Capitan and it's almost as fast as my 24GB Mac Pro.

I push it a bit with Logic Pro X + drum samples (for my V-Drums), but it handles that without complaints. But for web, videos and programming there isn't much of a difference.

But note that the Air has a SSD.

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