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