Collecting some information in this post:

iMac (Mid 2007 or newer) • MacBook Air (Late 2008 or newer) • MacBook (Late 2008 Aluminum, or Early 2009 or newer) • Mac mini (Early 2009 or newer) • MacBook Pro (Mid/Late 2007 or newer) • Mac Pro (Early 2008 or newer) • Xserve (Early 2009)

kext-dev-mode still works

Nvidia driver is….. still 310.42.05a43 , no love for maxwell

New root-less security is based on sandboxing shell and its commands, so you can’t edit system files even if you a root and file has 755 mode

files are editable if you boot yosemite

To disable rootless mode set boot argument rootless=0

You can still set boot-args with sudo nvram even in rootless mode.

No Metal for pre-Fermi nvidia cards

OpenGL still at level 4.1