Saxat från länken
I didn't know which to believe either, I've just been so pissed about this thing for a while.
So I decided to call local ViewSonic Contact Center and they were quite surprised to hear someone asking about this, but after little waiting a really helpful guy in the customer service did some research for me (called to some tech guy in Germany) and confirmed to me that the VP930 is really a 6bit+2bit FRC monitor. After that even he didn't recommend that monitor for me.
They told me that the reason they are calling it 8-bit monitor, is that in most of the countries (atleast here in europe) the legislative rules don't require ViewSonic/manufacturer to tell the customers that the 8-bit in the VP930 is actually a 6bit+2bit FRC. So they can market as a 8 bit monitor.