"Initially many were somewhat surprised that Capcom would port Street Fighter IV to the PC. However, Street Fighter IV was developed first for the arcades using Taito Type X2 hardware which is effectively just a PC hidden inside an arcade cabinet running Windows XP Embedded. The hardware is completely off-the-shelf - Intel Q965 chipset board with a Core 2 Duo E6400 CPU and a DX9 Shader Model 3.0 level video card - based on a bit of Googling, apparently a GeForce 7900GS is used for Street Fighter IV. In theory, only the encryption system used in the arcade version to prevent copying would stop you from loading the exact same code that runs in the arcades to a bog standard PC."
src:: http://www.yougamers.com/reviews/25119_street_fighter_iv-page3/
I predict that the Wii U will sell a total of 18 million units in its lifetime.
The NX will be a 900p machine
