5870CF vs 5970 on a P55 mobo

[Martzy]

Was just curious what the performance difference would be between Crossfiring 2x 5870s versus 1x 5970 on a P55 mobo? Keeping in mind the bandwidth limitations on the PCIe slots compared to x58.

Thanks

 

[Maziar]

2 5850s perform pretty much like a 5970;however,5970 runs cooler,quieter and has less power consumption.