I want to confirm that anyone who wants their Asus/Sharp 321 4K display running at 60HZ can use an AMD 7870 to do so. This one is flashed and modded to run PCIE 2.0 at 5.0 GT/S but I imagine it would do this without modding. Sadly, the flashed ones only show boot screen on MDP if both ports populated. Boot screen via DVI is good, and I think HDMI too, not sure. Will keep working on them. BTW, these are Pitcairn cards, not the "Tahiti Lite" ones, still can't find 5.0 switch on those. FWIW, I imagine that el cheap 7770 will do 4K @ 60 Hz as well, will update if anyone cares. Pretty funny when I consider my visit to Grove Apple store on Saturday. The iPad sellers there had nMP hooked up with HDMI and running at 30 Hz, pretty silly. I was also able to use "Display Menu" app to enable HiDPI mode. Clear and bright, very nice.