That seems not a niche feature from my view...

Maybe it's a feature that isn't often advertised (amd64 machines excepted). I find it frequently in the datasheets (and then verifying with schematics and testing).

Another non-advertised thing is "real" LVDS on the same physical pins as MIPI-DSI. Again, datasheets+schematics.

Datasheet the for RK3588 used says H265 will do 8k@60fps. I assume lower than 8K resolution will be able to do 120fps, but don't know how that translates.

https://www.cnx-software.com/pdf/Rockchip%C2%A0RK3588%C2%A0D... Page 7

Thank you for pointing me in this direction. the RK3588 seems to have what i need, now i just have to find it in a smaller form factor/just remove the ethernet port and other large connectors from it i guess.