Whats better asus Maximus III Formula or Maximus III Extreme

The Extreme is slightly better. at a higher price of course. It can handle higher speeds of RAM which wouldn't be all that noticeable. You can run three-way crossfire if you want, but you couldn't on the regular version. The extreme also has a built-in water-cooled northbridge. Here is a complete rundown of them both:

http://www.bit-tech.net/hardware/motherboards/2007/11/2...