Its an Asus Rampage III. Allows 4 video cards.

Maybe ill try removing a card since both cards will run at 16Ex maybe I'll get better performance. Or I can run CrossFire with 2 GPUs and 1 GPU Solo.

It allows up to 4 cards. all ports do not run at 16 X. My cards are running at 16,8,8

Im using Enermax powersupply 900 Watts. Its rated Gold for 80Plus.