FM2-A75MA-E35 Initiate with iGPU

So I'm currently attempting to try setting up PCI passthrough but got caught in the earlier stages. I'm having problems with setting my bios to initiate with my iGPU instead of my discrete GPU(which I intend to pass to Windows guest). Here is my setup:

CPU: A10-5800k
Motherboard: FM2-A75MA-E35
GPU: R9 270x
BIOS Version: E7721AMS v2.4

I have an HDMI cable plugged into my QNIX 2710 from the motherboard and a DVI cable plugged into the same monitor from the R9 270x. I've tried setting my "Initiate Graphics Adapter" from PEG to IGD but the video still outputs from the DVI. Can someone help me with this?