I was unable to see the Asus Motherboard manual, but your specs show only a VGA out connection. Is that the case or do you have an HDMI or some other type of video out?
If all you have is VGA, you don't seem to have much choice as to how you connect it to a HDMI only capable device. And as you mention, the resolution will be reduced, but all you can do it try it. The picture may not be very good....