PowerColor Radeon HD 7870 Myst Edition Crossfire Review @ OCC
 

When you look at the performance generated by a pair of PowerColor's HD 7870 Myst Edition cards, it's hard not to be impressed when you look at the FRAPS-based testing. Especially when you look at the performance at 5760x1080 where the narrower memory bus on the GTX 660Ti limits the bandwidth hampering performance. The FCAT testing paints a different picture of the Crossfire performance of the HD 7870 Myst Edition. Let me say up front it's not a hardware problem but a software problem that AMD hopes to have resolved as early as in June with its own frame metering driver. The hardware is capable enough but the software side has let the Crossfire experience down on the HD 7870 Myst Edition. In terms of game play the worst feel in game was by far in the Far Cry 3 testing where the game was just chugging along with visual anomalies that are present even when run in single card mode. It's got to be purely driver related at this point with the FCAT data backing it up.

http://www.overclockersclub.com/revi...ion_crossfire/