Comment # 11
on bug 102820
from dwagner
(In reply to Alex Deucher from comment #9) > Harry or Jordan can verify, but I think it means the board maker did not > validate the HDMI connector for 6Ghz timings. The asic may support it, but > the board has to be validated to make sure the physical connector supports > it and the traces are not too long, etc. Some boards only support 4k@60 > over DP. This is the manufacturers page advertising my graphics board: http://www.xfxforce.com/en-us/products/amd-radeon-rx-400-series/rx-460-4gb-heatsink-rx-460p4hfg5- It couldn't be more affirmative regarding support of HDMI 2.0b and high refresh rates for 4k modes... (And practical experience during the last months also tells me: Yes, HDMI 4k @ 60Hz output is stable - even when using a 4m length HDMI cable. > The driver drops the higher bandwidth modes for HDMI connectors if the board > does not support them. I have looked if there are any firmware upgrades for this card or any hints from others regarding lack of 4k 60 Hz support, but found neither. (I only found unofficial firmware that switches on shader units the manufacturer keeps dormant, but I am not using that.)
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