I have a DELL Latitude E6500 with a Core 2 Duo with a NVIDIA Quadro NVS 160m.
I followed this guide: https://osxlatitude.com/index.php?/topic/2674-dell-e64006500m4400-mavericks-109-gm/
I changed the EHCI to EHC1. It just kernel panics straight away with El Capitan. It works just fine with OS X 10.6-10.10.
Any Advice?