How many monitors with GTX 670 x 3?

[thepregnantgod]

It seems that I can only do 3 monitors with nVidia Surround. However, when I'm not doing Surround, how many monitors can be active with 3 GTX 670?

I'm thinking of getting 2 more 27" for 5x1 portrait...

 

[ANDHD]

12. Depending on manufacturer you can have even more or have less. This is just reference though.