ATI has made a notable comeback over the past year with enticing GPU releases that have been able to match and sometimes surpass Nvidia's offerings in terms of performance, power consumption and value.

However, that's not to say Nvidia has been sitting duck all this time, as they have promptly answered anything ATI has thrown at them. For example, earlier this year when ATI was claiming back the performance crown with the dual GPU Radeon 3870 X2, Nvidia was quick to react with an even more impressive and better performing card. The GeForce 9800 GX2 followed the same dual GPU path, using Nvidia's SLI technology and a pair of GeForce 8800 GTS 512 GPUs.

Then two months ago Nvidia launched their latest generation graphics cards consisting of the GeForce GTX 280 and GTX 260. Yet the Radeon HD 4870 and 4850 have proven to be excellent counterparts, offering similar levels of performance for a fraction of the price.

http://www.techspot.com/review/113-radeon-4870-x2/