Quote Originally Posted by darkskypoet View Post
I'd go with the 4870... 2 reasons

1.) In cf, adding a 4850 would slow your 4870 down to act almost like a 4850.. load balancing.

2.) In time, if the 4870 gets a bit slow for your requirements, a second will be cheaper then what you bought the first one for. Additionally, adding a 4870x2 may be a very viable option for a tri crossfirex setup. In a years time, they could also be quite cheap.
in another thread in this forum this is not true, since 4870 and 4850 in crossfirex are scale very well indeed unless your cpu is bottlenecking