The list author says: "This is merely a parts list, and why I chose them. The liquid cooling portion of this system is not listed.
The motherboard chosen for this rig is an XL-ATX size, with a massive amount of liquid cooling involved over 2 very high end server CPUs and 4 very high end GPUs. Most builder have this in a custom/modified case."
"Quantity: 4 Quad-SLI As fun as the GTX590 is, I prefer the full scaling of 4 individual GPUs with 3gb of VRAM vs a single card 2 GPU card. Also, the GTX590 Hydro Copper was limited edition and sold out very quickly. You can no longer officially purchase it from dealers."