Anyone care to guesstimate on the performance of the new card from Powercolor?

http://www.zdnet.com/blog/computers/powercolor-officially-launches-hd6870x2-two-amd-radeon-hd-6870s-on-one-graphics-card-for-449/621

Looks like it might be a bit more than half the price of one of the HD6990 cards.