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The Lenovo Thinkpad P50S (FHD - no touch version) screen comes with 2 different screens according to the specs. CLICK HERE TO SEE THE SPECS
15.6" FHD, 1920x1080, anti-glare, LED backlight, IPS, 250 nits, 16:9 aspect ratio, 400:1 or 500:1 contrast ratio, 160° viewing angle
AND 15.5" (394mm) 3K (2880x1620), anti-glare, LED backlight, IPS, 350 nits, 16:9 aspect ratio, 1000:1 contrast ratio, 160° viewing angle
Color gamut - 100% of the sRGB range
Color depth - DeltaE Color 2.35 / Grayscale 3.33
Color Accuracy - Output can be changed anywhere from 8 bits to 16 bits.
The dock is limited in a single DP 1.2 bandwidth but there is a 'branching device' in the nVidia topology that can handle 3 1080p monitors (2x digital + 1 VGA).
You can probably run 2 in 10 bit mode but the quality will degrade with the VGA.
Hope that answered your question.
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I just double checked to make sure and for all intents and purposes, you should be able to drive both on the system if you run it through the DP port. If you have any issues with it, don't use an adapter, get a straight 2-ended DP to HDMI cable and use that.
Did everything work as it should? Let me know!