While the exact performance results achieved comparing X1800XT Crossfire with 7800GTX SLI can not yet be published, we can tell you we benchmarked with F.E.A.R., Quake 4, Splinter Cell - Chaos Theory, Doom 3, Far Cry, and 3DMark05 at 1600x1200 resolution with 4X AA and 8X AF enabled. ATI X1800XT Crossfire won every benchmark over nVidia 7800GTX SLI in these tests.

We also ran standard scores (1024x768) for Aquamark 3, 3Dmark03, and 3Dmark05. Once again Crossfire X1800XT outperformed nVidia 7800GTX SLI in every benchmark.

We then ran all the same tests in single video mode, comparing a single X1800XT on the ATI RD480 to a single 7800GTX on the ATI A8N32-SLI. Benchmarks were run under the same conditions as Crossfire/SLI - 1600x1200/4xAA/8xAF in games and "standard" scores in 3Dmarks and Aquamark 3. Once again the ATI X1800XT on the RD580 was the winner in every benchmark. It is clear the new 5.11 drivers do make a difference in Open GL games like Quake 4 and Doom 3. Even more exciting, the RD580/X1800XT Crossfire will be a potent graphics combination.
Looking good..