Mac Pro 5.1 information
GTX 680 4GB Graphics card
Native support, but runs better with Nvidia Web Drivers and CUDA Drivers,will run at 4K for video editing.
This one will provide :-
Display Port x1
The upper DVI has no function as a result of being flashed for use on a Mac and providing the Mac boot screen. Normally mounted in bay 1 (x16)
SSD (480/500GB - 1TB - 2TB) Mounted on an OWC Excelsior S PCI-e interface giving a transfer speed of approximately 400-550MB/s, normally mounted in either bay 3 or 4 (x4)
SSD - Blade - Bootable PCI-e (64GB - 128GB - 256GB - 512GB) Giving a transfer speed of approximately 700-800MB/s, normally mounted in either bay 3 or 4 (x4)
SSD - NVM-express - Non Bootable But a really quick SSD in the region of 1400 - 1500MB/s, superb peice of kit for use as a scratch disk (Video Editing) - It has native support with macOS High Sierra.