Use discreet GPU and iGPU together for 5 monitors

i am maxing out 4 monitors on my 1080 card. I want to add a 5th monitor to my iGPU. I connect to the DVI port and the 5th monitor isn’t coming on.

i am on clover 4920 using LILU and WEG with a GTX 1080 (GA-Z77X-UP5-TH)

Thank you!