Ironic I see these posts today...
I am currently at work, but I have ordered myself
3 x Samsung P2770 27" Full HD Monitors as well as another 6870 to CFX my current set up! They have arrived as I have been contacted for successful delivery, so I will set it up as soon as I get home and post an opinion thereafter. I can thus have accurate results as to your questions!
I will run BC2 at High Setting to test for your sake!
I'll keep you posted!