My GTX 580's finally came in this week and I installed them last night and took the 5-box team for a spin.

System Specs:
Intel i7 950
12GB RAM
2 x Nvidia GTX 580
3 x Asus VE276Q
Win 7 Pro 64-bit

On the main Window I have the graphics settings at 'Ultra' with shadows turned down to 'Good'. On the alts the graphics settings are at 'Fair' with shadows set at 'Low'. This gets me 30-40 FPS in Orgrimmar and 60FPS (capped) out in other areas.

Resolution in each screen is 3240x1636, with the 4 alt screens aligned along the bottom of the monitor.

Apologies for the crap quality photos - I used my phone to take them.

Flying:


Main screen maximized:


Alt screen maximized - reduced eye candy, notably less vegetation, lower quality shadows.


Cheers,
S.