HD621 handles 24/192KHz input on HDMI and downsamples to 24/96 for 568.2MM so this might not be so clearcut as you may think. Use a recent HS 10/18Gbit certified good quality HDMI cable and tell us your results. 
DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.
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