From most of the reviews I have rad the 4850 is faster. The 4870 even takes out a GTX280 in some games...these new cards from ATi are really impressive. They stepped their game WAAAAAY up this time around. I am very impressed!!!
Currently Playing:
PS4 - Killzone:SF and Assasins Creed 4
XBox One: BF4, CoD:Ghosts, Dead Rising 3, Forza 5
Changing channels with my voice: priceless!!!