iXBT Labs posted a review on the ATI RADEON HD 5870 1024MB Graphics Card

It's a superb graphics card for its price range. It easily outperforms the competing GeForce GTX 285. Besides, the unprecedented overclocking features allows this new single-GPU card to compete with the dual-GPU GTX 295 as well.

ATI RADEON HD 5870 1024MB Graphics Card Review