I'm sure some of you have seen Newegg's shell shocker deal today with the MSI Radeon 6450. Will I see any performance increase if it is crossfired with a 6850?
couple of reasons why you will not see any performance increase -
amd does not allow crossfire between cards from two different model numbering scheme e.g. 6850 cards can only cfx with 6850 and 6870 (both from 68xx series), 6950 cards can cfx with 6950, 6970, 6990 (all from 69xx series) etc.
6450 gpu is much less powerful than 6850 gpu, does not require crossfire bridge.