Turns out Dell offers the Xrite i1display app for WIn and Mac free and it works with non-dell branded i1displays. This SW can be used cal and load internal LUTs (there are two user cal slots available). Use same i1display with DisplayCal and a newer 10-bit display port data path and for $600 total cost including colorimeter (!wow) ($700 if u want a 27in display, QHD) you are doing gorgeous wide gamut that's pure as virgin snow. I have found my 8-bit setup is producing perfectly smooth tonality with superb response, even without the custom LUT, so I will not seek to upgrade vid in this old Mac as not needed for my purposes. Safe to say that with this display you mosdef can see the limits of 8-bit appear in certain gradients. So I see why the industry has gone to "billions of colors" I did have a glitch where for a while DisplayCal got weird and started producing weird lumpy results. I shut it down, unplugged DTP94 then started over and everything was sweet again. No matter how far things advance, it seems a personal computer must be arbitrarily reset sometimes to make it work. I'm using MacOS Mojave on a 2008 Mac Pro with an NVidia GTX680 over DVI-to-HDMI /wire