@jebidia
Sorry for replying late, i was busy with nvidia sli mod at https://www.techpowerup.com/forums/threads/sli-with-different-cards.158907/page-121.
I will be happy to help you out,
What is your rev. number of your X99 UD4 motherboard ? You are using F23 bios
I will download its bios and mod it for you. after that i can guide you with next steps.
This whole procedure is not so difficult as it seems.
Thank you so much topmyseries5! I'm on REV 1.1 X99-UD4 with a 2699v3...Yes, I'm on F23 as well. THANK YOU!