Thanks Flor!an, I had a DP to mini DP cable hanging around and switched over, and full res on Mac side, also shrunk bootloader icons somewhat, much less grainy. It Reset my Display preference on Windows side to 100 from 125 percent, but easy to reset. The proprietary engineering program I work with daily on Windows side has to be 125% or it is too small to draw properly. Now if I just get the coders to fix the Windows 10 problems with it not being wysiwyg when printing that was not there with 7 and 8.1, all would be great with world. I will probably switch to a DP to Dp cable, as it is nice to have the button locks on both end of the cable. I had a Dp to Hdmi cable as well, if going Dp out the card to the monitor I wonder if it would work as well, but I doubt it, is it is not bi-directional, and it says it only supports 1920 x 1080 on the instruction sheet for that cable.