I'm not sure this is quite the case... Nvidia have had to work on a solution i.e. beta drivers... and these beta drivers were breaking other games. So Nvidia do not have a solution yet.
It is true that the equivilent Nvidia does beat the 3870 in single card mode... but as yet neither SLI or Crossfire are supported in the game.
I would comment that Other games i have played with the 3870's are flying. UT3, Bioshock and Cod4 seem to be well optimised.
The only problem i have is this...
ATI launched Crossfire as the better dual GPU process because it will work on ANY game without the need for bespoke driver support... Indeed if you search the ATI site you will find some statements and promotial material that says just that...
http://game.amd.com/us-en/unlo...d=EBIEA$69408@IEBDACCfor example.
This does not seem to be true anymore... wonder what changed and why they are misleading us?