Hello,
I have a GTX980Ti 6GB with 6 video outputs (3xDP, 2xDVi, 1xHDMI) mounted on a Z170X-Gaming-5 (port PCI-E 1) under High Sierra 10.13.6 with the latest Web-Drivers and Clover 4741.
The iGPU is disabled in the BIOS.
The SMBIOS used is a SMBIOS of MacPro6,1 (because I wish to add a GTX750...