ATI has learned that being the king of graphics means you must raise the bar for performance with each product release. The Radeon HD 4850 X2 is the latest evolution in graphics cards, and ATI delivers a product nearly as grand as their Radeon HD 4870 X2. Benchmark Reviews has been fortunate to test the Sapphire Radeon HD 4850 X2 Dual-GPU video card 11139-00-40R against a collection of todays hottest video cards available.