ATI's Radeon 5800 chipsets represent one of the largest leaps in video card performance in a long time. The HD 5870 has quite easily taken the top spot for single-GPU performance, and also holds its own against many of the dual-GPU cards on the market. The HD 5870 has 1 GB of GDDR5 onboard and a core clock speed of 850MHz, as well as full support for DirectX 11. It is a little big and occupies two slots in your system. While there are less costly cards available that will probably get the job done, we've rarely seen a high-end offering like this launch at such an attractive price point.
Compare Prices for the Radeon HD 5870 Video Cards