Double RAM or get a faster chip?

Hi:
I'm wondering, my server currently is a Dual P3 1.4 with 1 gig of RAM. I'm looking to boast performance to handle the huge increase in httpd requests. Is it better to double the RAM in this case when you already have 1 gig or go with a much faster chip instead like Xeon?

Thanks,

 

 

 

 

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