If you need to use the 3 monitors on IPC2 (2x HDMI + 1x DP), you cannot have the Display Port as Main.

You might encounter BSOD (Blue Screen of Death) and recover mode.

Here is the ideal configuration for 3 Display setup for Windows:


Advanced > System Agent (SA) Configuration > Graphics Configuration > IGD Configuration

IGD - Boot Type = HDMI 1

IGD - Boot Type = HDMI 2 

IGD - Panel Scaling = Auto

Spread Spectrum clock Chip = Software