MPro5,1,iMac14,2&14,3(2013),iMac3,1&13,2(2012),MBPro11,3(2013),MBP10,1&MBP9,1(2012) OS X10.11 Nvidia

StratDragon

Whew! That title barely squeezed in!

If you're on a mac released before 2014 AND have an Nvidia card AND upgraded to OS 10.11 El Capitan there appear to be drivers developed by Nvidia dated October 1st of this year.
I have not tried them but I do have a mac in this scope of the driver applicability and will try to get around to it after I determine why Creative Cloud stopped working two days into an upgrade. 

See this page for more details and apologies if this was posted before.

http://www.nvidia.com/download/driverResults.aspx/92173/en-us