Memory Question

I'm planning to buy a new Dell server.

The memory its using is a DDR2 400mhz or 530mhz single ranked ram.

I like to know the difference between 400 mhz and 530 mhz speed (performance) wise.

Is it worth $10 to upgrade from 400mhz to 530mhz?

Also what type of after market memory will be compatible with the original Dell ram?

Thanks.

 

 

 

 

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