Thanks for the tip on the new kexts for Samsung 950! Used the patch for 10.11.6 from RehabMans distribution. Everything looks good know.
I actually had an interesting problem last night, I believe this is related more to hardware than hackintosh:
Until now I have been using the old SSD as the EFI drive to boot into the m.2 drive. Yesterday I finally installed clover and co. to the 950 pro, booted up, and got stuck with initial boot screen. I was not able to access BIOS, nothing. Even reseting the BIOS did not do anything. Finally taking out all my Sata drives, and the m.2; and then reseting the BIOS did the trick.
Furthermore, plugging in the m.2 - everything works; plugging in m.2 + 1 ssd - same problem as before. So currently I am running the system with the 250gb 950 Pro, and two 1TB storage drives. My extra SSD's are unplugged.
Any idea what could be causing the boot problems?
p.s. During the problems the motherboard posted A2 messages, and now when everything runs I have A0 error codes.
edit. oh yes, it seems I have also lost power management.
System:
Gigabyte Z97X-UD5H
i5 4690K
Gigabyte GTX 950
Crucial Ballistix Elite 16GB 1866 MHz
(iMac 14.2)