HIS HD6770 IceQ X Turbo Crossfire Review
We have two very different comparisons with Crysis Warhead. With the settings at Gamer and the anti-aliasing off we're looking at the single-card performance and the HIS is around the same as the two cards slightly above it in the Radeon range, the HD6790 and HD6850. Obviously the Crossfire settings dominate the graph as they would when compared to single-cards.
Cranking the image quality up to Enthusiast and liberally applying some anti-aliasing is aimed at testing the Crossfire performance, and the HD6770 doesn't do badly at all. Up there with plain GTX560s in SLI and the HD6870CF setup.