If you install with the Dell Dual channel and the Dell Quad channel together, and the you install the OS to a disk controlled by either one of these controllers, you will receive a kernel panic when the system reboots. After further examination we notice that the initrd is not being created in /mnt/sysimage/boot. If you perform the same install with two of the quad channel controllers or two of the dual channel controllers the problem does not occur. It is only a problem with one of each together during install.
This issue has been sent up the chain at Dell and they, along with AMI are taking a look at this. Red Hat does not have the hardware in-house, so we will wait to hear from Dell/AMI.
There is an updated kudzu RPM that fixes this problem which can be downloaded from http://people.redhat.com/notting/kudzu/ Another work around to this problem is to go to the bash shell after installation is completed but before exiting, get to root mode, comment out the line 'alias scsi_hostadapter* unknown', make the initrd.img and updating lilo accordingly.
Closing, as this particular bug was fixed in the kudzu currently in rawhide.