2017-07-07, 10:11
When people are talking about 3840x2160 at 60Hz refresh it's REALLY important to also confirm your colour subsampling. There's a huge difference, in HDMI terms, between 4:2:0 and 4:2:2 in this regard.
Many early UHD displays only accept 3840x2160/60p at 4:2:0 and can't accept it at 4:2:2 (this is because the HDMI 2.0 support was retrofitted to HDMI 1.4b hardware - and the HDMI 2.0 mode of 2160/60p at 4:2:0 just squeezes into the legacy HDMI 1.4 bandwidth. This is how nVidia were able to support 2160/60p on older GPUs which on paper initially only had HDMI 1.4 outputs)
I have a feeling this may be why some people have no issues, and others do...
Many early UHD displays only accept 3840x2160/60p at 4:2:0 and can't accept it at 4:2:2 (this is because the HDMI 2.0 support was retrofitted to HDMI 1.4b hardware - and the HDMI 2.0 mode of 2160/60p at 4:2:0 just squeezes into the legacy HDMI 1.4 bandwidth. This is how nVidia were able to support 2160/60p on older GPUs which on paper initially only had HDMI 1.4 outputs)
I have a feeling this may be why some people have no issues, and others do...