AMD today announced the world's fastest graphics card, the ATI Radeon(TM) HD 4870 X2, advancing visual computing ever closer to eye-definition computing gaming and cinematic experiences and delivering a whopping 2.4 teraFLOPS of processing power. Also announced today is the ATI Radeon(TM) HD 4850 X2 graphics card, delivering blistering performance at a compelling price point.
These cards comprise the ATI Radeon HD 4800 X2 series, combining two ATI Radeon HD 4800 series GPUs with a more advanced cross-GPU connection based on the PCIe 2.0 standard, plus two gigabytes of memory - the most in any currently available consumer graphics card. These technologies combine to make the ATI Radeon HD 4800 X2 series perfectly suited for the most demanding games, able to deliver astonishing frame rates at extreme resolutions and image quality settings.
Anandtech has some excellent benchmarking and relevant discussion about this new card here: