[CentOS] Re CentOS and Intel graphics

Hello,

I have an Intel NUC7i3 with 620 graphics and an Intel NUC7i7 with 640 graphics.
I have loaded CentOS 6.9 and the graphics is not fully working.
I believe that I need a driver.
Does CentOS support the Intel 620 and 640 graphics and if not, can someone please point me in the direction of the drivers, with install instructions.

Regards,
Mark Woolfson