Adserver with mysql+apache

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I have an adserver - redhat p4 2GB ram - during peak time the server
crashes with hundreds of queued processes (load average 70.00!!!). It
serves approx. 1.000.000 impressions per day (page views) - images on
remote servers. The database simply select + update views#.

I was considering an upgrade to a bigger server with 8-10G RAM (mayby a
dual xeon) or a cluster load balanced solution. The traffic could grow
in the future!
Also, I'm not sure if having 2 dedicated boxes for mysq and apache
would be positive. At the moment I have all on the same box.

Do you have any experience with high traffic services - and low budget
- that you could share.

Thank you

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