ATi HD 4850 Crossfire - DX9 Tests
 

What is rather obvious is that the 4850 makes the 3870 virtually obsolete ... of course, the 3870 will cater to another category of buyers, given its pricing, but it's quite telling that the junior of the current RV770 hierarchy beats what was until recently ATi's most powerful single GPU solution, and does so in a rather impressive manner.

http://www.rage3d.com/reviews/video/.../crossfiredx9/