Did the Lab51 guys have access to all this stuff that JF-AMD pointed out in his FAQ?
Not sure if OS optimize and app with the latest flags would make a big difference, but who knows.

Q. I saw a benchmark on xyz website. Is that how bulldozer will perform?A. No. Nothing posted before launch will be representative of actual performance. To get actual performance, you need:

Final production silicon
Final processor microcode
Final system BIOS
Final OS optimizaitons
Final drivers
An app compiled with the latest flags
A person who understands the app and configures the test properly

Without these things (and there are probably more), you cannot get an accurate benchmark. Any extrapolation of a crappy benchmark gives you a crappy estimate of actual performance. Period.