You can extract the following from the discussion above:

- the board has the same length as the 4-way, but is wider by a fair bit. That's why I called it Enhanced (CF E759/60) XL-ATX (E762)...

The size of actual highend boards is really ridiculous. It forces (potential) buyers to get a case out of very few appropriate ones. Maybe that is intended to push the case market (cases which only sell bad *gg* or developement of new ones) to fight the financial crysis