They claim they each chip runs at 1.5Mh/s with 12 chips per board that's only 18Mh/s. So the 50Mh/s units have 3 boards and the 250Mh/s units will have 14 boards? Something is not adding up here. The Viper case is going to hold 14 boards? Is this correct? From the case dimensions they've given this doesn't seam to make sense. Can someone shed any light on the topic?
That is correct. The CAD drawings of the case for the 250 MH miner show 15 hashing boards
Quite how they are connecting the boards to 10 power connections isn't clear. However, the boards have 2 power connectors - possibly they are connecting the boards in groups of 3, with the 1st and 3rd connecting to the power ports, and then the middle board connecting to boards 1 & 3.
That would explain why their test board only had 1 PCI-e connector attached. If it's not been used in a miner, and only used for testing, it only needs 1 power port.