Need some advice. I have a Mac Pro early 2008 and I want to put an internal SSD in it. I was thinking of getting a Samsung 850 EVO and a 2.5 to 3.5" adapter (NewerTech AdaptaDrive). I will be running El Capitan. I have read all kinds of confusing things about TRIM and whether it should be enabled or not and about Samsung 840s having problems with firmware. So is running El Capitan with a Samsung 850 EVO a good choice? And do I need to enable TRIM in El Capitan?