Server recommendations?

Bewuntline

Hello,
I have a forum website(invision board) and need some inputs to select a dedicated server.
My forum has 8 million posts (Including posts and topics) in total.
Right now i am using Xeon 5260 2 bay chaisis
12 gb ram
400 gb SD
I just want to know how can we determine the server configuration ..based on what factors?
Current issues i am facing is database table crashes....
Do you know anything about Hostingsource.com dedicated servers? Are they good enough to try?

Thanks

Sniglamen

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Leofellow

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Tapioca

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Bewuntline

Thanks, guys. Any other suggestions?