
There is more tubing on the other side of the case (to reduce the amount over the motherboard). This is a single-loop setup, albeit a fairly complex one.

I've used a mix of 3/8th and 1/2 inch ID tubing and barb and compression fittings, as appropriate for different bits of the loop. It's fairly restrictive but that problem is solvable simply by using two of the most powerful pumps available.