I'm wondering if I should spend $60 and upgrade from 12GB to 16GB RAM on my mid-2011 iMac. Does anyone think that will be noticeable? Any guess on if El Capitan will benefit from the greater memory? I'm leaning toward replacing the computer in 2016 in any case. If that happens I will probably hand off the computer to my Mom and it will be used for nothing more than email, web and streaming videos of European television shows (think Downtown Abbey and the like). So there won't be any performance advantages there with the extra RAM (Mom is currently using my iMac 2006 and I know she is running a risk of HD failure using such an old computer. So a switch there might be a good preventative move.) I game sometimes on the iMac and occasionally do a bit of movie editing for vacation videos and stuff like that. No photoshop these days so I'm not pushing my computer very hard very often except when gaming. But I assume that my GPU is the limiting factor in gaming these days and my current 12GB RAM is more than ample. But $60 is no big deal and obviously putting in the new memory takes five minutes. So should I just do it?