According to Kepler_L2, UDNA GPUs – codenamed GFX13 – will support 64 Gbps and 80 Gbps bandwidths over HDMI 2.2 connections. If the report is accurate, ...

This big upgrade for HDMI bandwidth could also coincide with AMD adopting the full DisplayPort 2.1 bandwidth, too.

AMD's next-generation UDNA-based Radeon cards may ship with the latest HDMI 2.2 connection, but not at full speed.