Is it worthwhile to upgrade my 4850's to a 6870? I game at 1680x1050 and 1920x1080 (I have a tri monitor setup) depending on what games I can crank the eye candy up on said resolutions. And since I have three monitors on my desk, I need to have a videocard setup that can support 3 monitors. I am not sure if I can run three monitors off of one 6870.