http://www.tweaktown.com/articles/2934/sapphire_radeon_hd_5870_1gb_in_crossfire/index.html
"As far as results go, we've included the important ones here; single HD 5870 and CF HD 5870 to see what kind of performance adding a second card does. We've also included the GTX 295 which is the top dawg from NVIDIA and to be honest, is still the fastest single graphics card on the market. This setup, however, should give us a bit of a sneak peek into what to expect from the HD 5870 X2 when it's inevitably released.
We've also included the HD 4890 in the results for good measure, so we continue to see just what kind of performance gains are seen from the HD 5870."
"As far as results go, we've included the important ones here; single HD 5870 and CF HD 5870 to see what kind of performance adding a second card does. We've also included the GTX 295 which is the top dawg from NVIDIA and to be honest, is still the fastest single graphics card on the market. This setup, however, should give us a bit of a sneak peek into what to expect from the HD 5870 X2 when it's inevitably released.
We've also included the HD 4890 in the results for good measure, so we continue to see just what kind of performance gains are seen from the HD 5870."