I am considering the move from the GTX 285 to the ATI 5770. The reasoning behind this is that I'm wanting to change from a Dell 30" to the new 27" Cinema display. And obviously the 285 won't connect to this monitor. My biggest concern is the potential drop in performance. Having said that the Most intensive graphics application I have is Call of Duty 4: MW. This is at the moment at least. If better game come out that are more graphics hungry things may change, but I can still upgrade down the track. I'm really struggling to find any comparison between these two cards. Does anyone have any experience of making this 'downgrade'?