ATI unleashes HD 5800 series desktop cards

As many of you know, today is the day ATI lifts the curtain on its latest generation of desktop based graphics cards, with two models kicking things off in the HD 5850 and top end single GPU offering, the HD 5870. In the near future we’ll see others added to the lineup with the most anticipated model being the dual-GPU based HD 5870 X2, all of these being the first DirectX 11 supporting cards to hit the market. How well does the new HD 5870 perform against the still solid performing older generation HD 4890 and competing models from NVIDIA? Link