Question about servers and speed.

[kawe]

For default vBulletin, you can't separate anything ( you can separate just an icon status etc )
but with vBulletin modification you can separate anything
example :

SQL Database for Category GENERAL DISCUSSION ( this category have high traffic ) in Server A
SQL Database for Categoty COMPUTER ( this category have high traffic ) in Server B
All PHP File in Server C
Blog + Groupe + Private Message in server D

but, u need advanced in PHP, Load Balancing, Tweak and etc