BLAST on Intel vs. AMD CPUs
1) when clock speeds are normalized, performance differences are not large
2) physical cores beat mix of physical and virtual cores
3) AMD "provided comparable performance to the former [Intel] at roughly 1/3 the power usage per core"
The results are not entirely surprising... in fact some might even ask what's the point.. still it's interesting that few people do benchmarks for bioinformatics when gamers and overclockers do benchmarking so often.
Caveats: Systems tested were not entirely similar (but that's a tough thing to do when you ARE comparing different platforms)
For more details.
You can download the white paper here.