Why can't I set both 170Hz and 10bit simultaneously via DP?

The Q8 cannot enable 10bit color at 3440x1440 resolution and 170/165Hz RGB mode because the required bandwidth is 26.5Gbps, which exceeds the actual bandwidth of DP1.4, which is 25.92Gbps. It is recommended to set the graphics card output to 8bit to support 170Hz or lower the refresh rate to 144Hz or below to support 10bit.

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