Displayport 1.3 which supports 5k 60fps became widely available with the NVIDIA 900 series just 5 months after the 5K iMac released. AMD followed suit 1 year af

Displayport 1.3 which supports 5k 60fps became widely available with the NVIDIA 900 series just 5 months after the 5K iMac released. AMD followed suit 1 year after. They could have very soon added support for it, maybe even launched with DP 1.3 support if they worked something out with AMD.