[CentOS] PI3

Hi All,

I downloaded:
http://mirror.centos.org/altarch/7/isos/armhfp/
for the PI3

This article says the PI3 runs X.
http://news.softpedia.com/news/centos-7-linux-officially-released-for-raspberry-pi-2-banana-pi-and-cubietruck-497891.shtml

When I groupinstall Gnome desktop and reboot, then run startx I get an
error about no screens found.

Whats the trick to get X on the PI3?

Thanks,

Jerry