eTeknix.com posted a review on the AMD ATi Radeon HD 5700 Series

With the recent release of the first fully DirectX 11 compatible graphics card, AMD have dealt a good first blow to nVidia, with the 5870 offering performance exceeding nVidias fastest single GPU card the GTX285 and the 5850 offering impressive performance for £100 less. However if history tells us anything it is that high end cards are not where most purchasers will be putting their hard earned cash and as a result the 5700 series will be far more critical to AMDs success in this latest generation of graphics cards, than the 5800 series. If this mid-range series of graphics card sell well then AMD will do very well the graphics hardware market, it really is that crucial.

http://www.eteknix.com/previews/amd-ati-radeon-hd-5700-series-preview/]AMD ATi Radeon HD 5700 Series Preview[/url]