I would like to know if you manage to update without any problem ?
Actually had to hose a lot of stuff, but it;s mainly because of my setup on an two ssd raid0 array with a 970. (nv_disable=1 at first.)
I think it would have been smoother if I would have been on a single drive, it would have given me a lot less trouble, because I could have updated from the .app.
I installed to a separate usb drive, then made an image, destroyed/the recreated the ssd raid with a command line, because disk utility doesn't have the cool gui to make raid anymore (so much for progress....
)
So it's a scratch reinstall for me.
had a clover issue detailed here
http://www.tonymacx86.com/el-capitan-desktop-support/169534-cloveralc-audio-id-issues.html with the audio. Ran the script again... audio works. sleep too. all at 4.2ghz.
Have to sleep, it's one of those "omg I just hosed my hackinstosh days".
That being said, kinda like el cap, not that it's so different. The dual window snap they have is kinda interesting.
Have no idea for your problem, try booting again, maybe you have to let the recovery partition do the install like on a real mac. Have no idea for amd cards.... try verbose booting to see where it stops.