this is not true, some intel mainboard have a function called multi display, i think asus have it.. u can connect 3 monitors when u enabled it... 2 on gpu and 1 on intel gpu
https://www.youtube.com/watch?v=0BoktTdEZFE i think this is a example
https://www.youtube.com/watch?v=0BoktTdEZFE i think this is a example