Need a right my.cnf and httpd.conf for 4G ram

Hi
Because a heavy load from mysql database so I'v just upgrade my box to 4G ram , it was a dual opteron 242 . But it look like a server load do not decrease lots . Could some one can help me to have a right my.cnf and httpd.conf for 4G ram ? My server have only one forum with around 800MB mysql database.
Thank you.

 

 

 

 

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