FreeBSD Scaling on 6.2-RELEASE?

I'm looking at new machines for high access forums / DB
and wonder if anyone has any experience with how well
FreeBSD specifically 6.2 scales on Dual Quad Core Intel's.

We have some Dual Dual Core's here but I'm considering
the Quad Core upgrade but am a little concerned that
this may start to become OS limited given the 8 Cores.

The software we will be running is vBulletin so apache +
php and mysql.

Does anyone have any experience / results they can share?

Regards
Steve


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