I recently picked up a Radeon 4890 for $119 on clearance at best buy, I was already running a 4850 both are 1gb models. I was wondering if anyone knew if I would be better off running a mixed crossfire setup or just the 4890? From the research I found it would basically downgrade the 4890 to a second 4850 which is showing higher on the performance list that the 4890. Does anyone have any experience with this? I am generally happy with the 4890 atm so it is not a big enough deal to purchase another(althougth i did have them call around in the area and no others had it).