MacVidCards will begin offering EFI flashed GTX960 cards for Mac Pro 3,1/4,1/5,1.
These cards use less power then other cards, but OpenGl scores are lower then GTX680.
A primary advantage is that many have 3 @ DP ports, allowing use of a 5K display. They will also allow an EFI boot screen on 4K SST displays, something no "official" card has ever done.
More details coming.