4GB RAM, spinning HD. 2.4 GHz Intel Core 2 Duo Currently running 10.6.8 This is a machine that is going to be mailed off to my mother-in-law. I'm considering putting El Cap on it to keep her 'future proofed' as much as possible (eg. if she upgrades to iOS 9 on her iPhone, etc). I won't have physical access to it once I send it to her. Anyone have any comparisons of El Capitan on a machine like this vs. 10.6?