The 5k iMac was really ahead of it's time in late 2014. I remember reading some technical blog talking about the custom designed driver board for that panel. Th

The 5k iMac was really ahead of it's time in late 2014. I remember reading some technical blog talking about the custom designed driver board for that panel. The 2015 MacBook pro could drive a 5k panel using two displayport cables (some 5k monitors from that period supported that solution for full resolution at 60Hz), and with modern displayport there should be no problems, but maybe Apple does not really want their computers used as 'dumb' displays anymore...