Hi,
I just upgraded from Yosemite to Sierra. I used Moarfish's set up (Thanks!) and no problems except for no USB 3.0 and couldn't wake up after the computer went to sleep.
Before in all my setups up to Yosemite, I was able to get 3 monitors, DP with adapter, DVI and HDMI but I had to use Kudzu framebuffer. Duckweed only gave me 2 monitors. Only thing that I noticed before is that using Kudzu, my card read 6xxx but it worked fine.
With the new set up using Sierra, right after the installation I only got 2 monitors. I supposed this is due to the ATI inject using Duckweed. I downloaded Clover Configurator and changed it to Kudzu. Restarted and after a few mins it froze then auto restarted. I removed Kudzu but still the same problem. Had to reinstall. (did this a few times trying different framebuffers)
For the sleep issue, I tried darkwake 0 (as suggested in some other posts) using Clover Configurator and after restarting it also froze and auto restarted.
It seems any changes I make in Clover Configurator causes my computer to freeze after a few mins then it just restarts. For now as long as I don't use CC, so far so good except for the sleep issue and USB 3.0.
Any advice on Clover Configurator, USB 3.0 and the sleep issue is most welcomed and appreciated. Thanks!
UPDATE:
I installed clover efi bootloader. Tried changing the plist (chameleon) to kudzu to get my 3 monitors going. Didn't work. Only thing it changed was the gui (now clover boot manager) when logging in. Then I installed clover configurator again. Changed the framebuffer to Kudzu. This time it worked. No freezing and shutdowns. Got my 3 monitors working. Card reads as 6xxx like before but all 3 monitors are good now. Don't really know what happen but it's working now.
Only issue now is no USB 3.0 and I forgot to mention in my last post, slow boot up. Any advice is appreciated.