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HDMI forum rejects AMD's open source 4K@120Hz and 5K@240Hz HDMI driver
(www.tomshardware.com)
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Aside from DisplayPort having more bandwidth, as someone else pointed out, HDMI is consumer video garbage. DisplayPort was designed for use as a computer display. Also, HDMI Forum is a cartel that charges ridiculous licensing fees for their proprietary interface. VESA is a standards body and their licensing costs are much more reasonable.