Back a bit, I had intended to have one of my FC630's configured with eight 1.8" drive bays instead of the two 2.5" to allow for a few more drives for this particular server. As it turned out, apparently, the PERC controller was connected in such a way that in order for it to work, two CPUs were required, so since I want to run single CPU machines, that wasn't going to work. However, I was just looking at the FC630 manual, and in the first page after the table of contents, (Page 7), it says 'Single processor: Up to eight 1.8-inch SSDs'. 

What controller/backplane combination would allow the 1.8" drive bays to function in a single CPU configuration?