If you look at the back of the XPS 8900, there is 2 monitor connections (DP and HDMI) on the motherboard. This would be the Intel 530 GPU that comes with it. Then my system also came with a GT 730 PCIe card. Currently, I have dual monitors working using the DP on the motherboard and the DVI port on the GT 730.
I am wondering if this system supported dual monitors, but only on the internal Intel 530 card with both connections hooked there?
I had an HDMI to DP cable that I tried, but windows never found the 2nd monitor. So, I don't know if 2 monitors on the Intel 530 card are not supported (I am sure Intel supports this, just not sure Dell enabled this) or my cable is broken.