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Do the displays have a DP 1.2 mode switch? That can do 4K60 10bpc without DSC.

DP 1.3 has the bandwidth of DP 1.4 but without DSC. Does it have a DP 1.3 mode?

The Nvidia limitation with DSC is described in
https://nvidia.custhelp.com/app/answers/detail/a_id/5338/~/using-high-resolution%2Frefresh-rate-displays-with-vesa-display-stream

It seems to indicate that you might get around that by using a lower bandwidth display mode. Try selecting 4K60 for each display. If that works, then maybe you can try higher resolutions. 4K95 is the max CVT-RB timing for 10bpc. 4K118 is the max CVT-RB timing for 8bpc.

Display Stream Compression capability is described in the DCPD info of DisplayPort. You would need a DPCD emulator to override that. Or a driver patch.

I suppose a DisplayPort MST hub would just pass through DSC even if the hub doesn’t support DSC itself?

A DisplayPort to HDMI 2.0 adapter will negate DSC. HDMI 2.0 can do 4K60 8bpc.

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spam and misquote.

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