Fortunately, video editor Thomas Grove Carter has since demonstrated that the iMac Pro can in fact drive the Pro Display XDR, but only at a 5K resolution. This is likely because the iMac Pro uses Intel’s older “Alpine Ridge” Thunderbolt 3 controller without enough bandwidth to drive a 6K display.
Confirmation that the #iMacPro does drive the #ProDisplayXDR 🧐
At 5k. Not 6k. pic.twitter.com/3k91J00IzY
— Thomas Grove Carter ✂️ (@thomasgcarter) December 13, 2019
To use the Pro Display XDR at its full 6K resolution, the display must be connected to the new Mac Pro with MPX Module GPUs, a 2018 or later 15-inch MacBook Pro, a 16-inch MacBook Pro, or a 2019 iMac. To our best knowledge, all of these models are equipped with Intel’s newer “Titan Ridge” Thunderbolt 3 controller.
The Pro Display XDR also works at full 6K resolution with any Mac with Thunderbolt 3 ports paired with a Blackmagic eGPU or Blackmagic eGPU Pro. Those external GPUs are equipped with the “Titan Ridge” controller as well.
The Pro Display XDR is aimed at professional users, with a 1,000,000:1 contrast ratio and a peak brightness of 1,600 nits. It is priced at $4,999 and up.
(Hat tip to Myke Hurley!)