Synthetic bench don't translate well the game performance, and this results are probably based on the 10.2 beta driver, not sure about the NV driver though.
For nVidia's sake, I hope this isn't true. I hope that they are already using 10.3 drivers, because if they are not, the 5870 will be _very_ close to the GTX480. 10.3 gave some nice boosts in both benchmarks such as vantage, as real world games.
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