HardOCP does another comparison with the Radeon HD 2900 XT. They install the card in a system and use the latest drivers available to compare the card to the much cheaper and more energy efficient GeForce 8800 GTS 320MB.
It's kinda sad for AMD/ATI to see that this $120 cheaper card from NVIDIA performs a lot better than the R600.
This evaluation is the embodiment of what video card value is to the gamer. We have a video card, the 320 MB GeForce 8800 GTS at around $289 providing a noticeable gameplay experience advantage compared to the ATI Radeon HD 2900 XT that costs $409. In some cases the performance gap is very wide (S.T.A.K.E.R. and BF 2142), in other games performance is closer (Oblivion, Lost Planet), but in most cases the 320 MB GeForce 8800 GTS is providing higher framerates than the ATI Radeon HD 2900 XT sometimes equating to a better gaming experience.