The 2x3 as you call it, is better known as a 6-pin PCI-E connector. The additional one below the left socket is for extra power to the PCI-E slots for highly overclocked quad GPU action. The board for sure is an overclocking beast. Look what Shammy and K|ng|n did with it a couple weeks ago.
http://www.evga.com/forums/tm.aspx?m=316295
BTW, EVGA is sponsering an event for the next month for team OCA hwbot members to win one of these beauties.
http://www.overclockaholics.com/foru...ead.php?t=2521
Damnit Kal-EL, lemme respond once please? You are too fast.