Dedicated MySQL Server

[Issam W. Alameh]

Hello,
I am running a hosting company, where many of my customers are installing vbulletin which
is a php bulletin board on mysql database,

they got a lot of access, I have now 5 boards on one server, and sometimes the server
become very heavy, 

is it a good Idea to have a dedicated mysql server, and will this makes things better and
faster,

I am thinking of celeron 600 with 512MB ram, what such machine can serve and what is the
best way to configure and start the database server..

Regards
Issam