AFAIK those school and workplace Dell have a “display routing” function in BIOS that is ON by default to simplify IT’s job on deployment and cable management with very little performance hit. For my build in the image, I did it intentionally to make Windows utilize the iGPU so that the 5080 can have 1-2GB of VRAM saved to be used for loading models. This is my render/AI rig and I don’t use it for gaming.