Sorry if this is not the right place for this question...
I am looking at the Asus Crosshair Formula extreme which has the Lusid Chip onboard. I just need some clarification on how it works. Does it mean I can use one Nvidia Fermi and one ATI Stream on the same board and they will run as if they were 2 Nvidia cards in SLI or two ATI cards in Crossfire? Or does it just mean It can use either one on it's own without using a bridge?
Both the ASUS Crosshair IV Extreme and ASUS Crosshair IV Formula are CF MOBOs and are NOT SLI compatible. Keep in mind AMD purchased ATI; ATI = CF. nVidia = SLI. They are at war so AMD suffers because of this battle.
If you want SLI and AMD then I recommend the M4N98TD EVO.
However, Intel X58 and P55 chipset MOBOs support both CF & SLI. Games and Rendering Pros prefer the Intel platform because for the better scalability and performance gains over the AMD platform.