The long awaiting Asus Striker II series mobo finally leaks some imformations. Striker II is based on 790i, Striker II Extreme is 790i Ultra, and Striker II NSE is a normal 790i. Both mobos are standard ATX design, and feature on-board reset/power button.
From the layout pic we can see both NSE and Extreme shares a same layout design. But Extreme can support a higher DDR3 memory, up to 2000(OC) while NSE is only can up to DDR3 1600(OC).
Of course there will more difference than this, like BIOS setting and etc. We are waiting for more information about the 790i series.