It is not a matter of believeing, performance is a matter of reality...
There have been a great many reviews already done where actual Woodcrest chips have been benchmarked, and they perform they way they perform...
There are always modest tweeks to the die as subsequent steppings come out, but these are tweeks - NOT anything radical.
It's not like Intel produces some fake Woodcrests that go like $%^%% and the will produce bogus ones that don't..
Hey the shipping ship IS the engineering sample +/- a tweek or two...
Performance won't change.
Intel fanboys will find and tweek specific benchmarks that show Woodcrest to be a killer monster chip (SSE optimized, fits in 4 meg cache)
AMD fanboys will find apps where Woodcrest hurts (Huge bandwidth, non-optimized code with lots of code branches) to show it sucks...
But broad specturum benches will show what they have always shown...