Legit Reviews compared ATI and NVIDIA in Company of Heroes DirectX 10:

Last month we showed DirectX 10 performance on Call of Juarez and Lost Planet: Extreme Condition and found that ATI was lagging behind the competition when it came to DirectX 10 gaming benchmarks. After testing the first DirectX 10 game patch on the popular title Company of Heroes we again find out that ATI finishes behind NVIDIA in DX10 performance tests. Sure, the AMD/ATI drivers are still new and need to be worked on, but it doesn't seem like the current Radeon 2900 XT with 512MB of GDDR3 memory has the muscle to compete with the GeForce 8 series on DirectX 10 game titles.

The current Radeon 2900 XT with GDDR3 memory? It seems that later this month AMD will be releasing a new Radeon HD 2900 XT graphics card with GDDR4 memory. AMD plans to take another shot at Nvidia with this new version of the Radeon HD 2900 XT that features double the memory and improved memory bandwidth thanks to the higher memory clock speeds. This means we will soon see Radeon HD 2900 XT video cards with 1GB of GDDR4 memory per card! This card will remain at 9" (23cm) in length, just like the current model that's outfitted with 512MB of GDDR3 memory. I guess pretty soon we will be talking about how Nvidia's $800 GeForce 8800 Ultra comes with "only" 768MB of GDDR3 memory compared to the 1GB of memory on the Radeon HD 2900 XT. Oh how the times change...