Hey first post, but I used the resources here to make a decision and thought I would share the results.
Add the Inateck KTU3FR-502U (5 + 2 PCI USB3.0) card to the list of boards that work out of the box with El Capitan. This is on a Mac Pro (Early 2008; MacPro3,1, El Capitan 10.11.1)
I had to replace an Anker 4 port board (was getting USB 2.0 after a long delay). I was using the GenericXHCD....drivers can't remember the rest of the acronym. However, SIP killed the GenericDrivers and I'm tired of messing around with KEXT's and crap. That's why I bought a Mac...tired of PC work-arounds. So, if you need a lot of USB ports, 5 external, 2 internal, the KTU3FR-5O2U PCI-E USB 3.0 card from Amazon works great OOB on Mac with El Capitan.
Here's the simple URL:
http://amzn.com/B00FPIMICA $25.99 Prime Shipping
CaptnJB