During the initial testing I found that the 790's wouldn't completely reboot with CentOS 6 installed or booted into the install media. They'd get as far as "Restarting".
The solution is to pass an option to the kernel:
This can be added manually to the grub configuration file for systems already installed. For kickstarting:
1. Add the option in your kickstart file
bootloader --location=mbr --driveorder=sda --append="crashkernel=auto rhgb quiet reboot=pci" --md5pass=$1$.xxxxx
2. During the initial boot off of the CD/DVD, press TAB to alter to boot options (this is all one continuous line broken into multiple for readability)
> vmlinuz initrd=initrd.img ks=http://192.168.1.5/ks/el6/wks1.cfg ip=192.168.1.100 netmask=255.255.255.0 gateway=192.168.1.1 nameserver=192.168.1.1 ksdevice=eth0 reboot=pci