Lots of sites say different.
Ah, thanks. Doing some digging, it seems only the Turing (nvidia 2080) cards support DSC, while the Pascel cards (1080) can be patched* to use DisplayPort 1.4 but without DSC (or at least no DSC 1.2).
* https://www.nvidia.com/object/nv-uefi-update-x64.html
* https://en.wikipedia.org/wiki/Turing_(microarchitecture)
* https://en.wikipedia.org/wiki/Pascal_(microarchitecture)
* Turing specifically calls out new DSC 1.2 support https://devblogs.nvidia.com/nvidia-turing-architecture-in-depth/
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