Coming back with more pics...
I am so glad you talked me into getting the 100cm ones that you had in stock a few weeks ago. As I am waiting for my materials to arrive to build my framing, I wanted something up and going now. So, I yanked an old 730x from the close, removed the old Nvidia GPUs and slapped in 5 PCIe USB riser cables from RickJamesBTC that I bought here, laid the GPUs on the floor, hooked up one of the 1350 single-rail GPUs laying around (causeh the factory 1000W Dell PSU only has 18A 12V rails that flip too easily for mining).
And...




Freakin awesome!
For the record, that motherboard is the factory motherboard from an Dell XPS 730x X58 H2C gaming machine. It uses off-the-shelf ATX components. We have a very large dedicate community dedicated to this special chassis. I even setup a wiki for it a while back:
http://730x.org I'm kind of the expert on them (writing USB drivers for the old Nvidia ESA stuff, that this chassis has built in).
Anyhoot, that motherboard is an MSI motherboard that was made specifically for Dell. It has 3x x16 slots, and 2x x1 slots. You can find them on ebay for like $50 to $75. "Dell 730x motherboard" Make sure they are not "Dell 730" <- that "X" in the 730X means X58 INtel chipset. A "non-X" means NForce LGA775 socket!
A virgin copy of LTCRabbit freshed minted onto an USB, booted, and BAM - all 5 GPUs mining away (no tweaks yet).