The fact that you are planning to buy a new server means either you have already reached the limits of the present setup or expecting that to happen soon. How do you know that the added hardware will take over the additional load? I mean, have you identified the database server as the bottleneck? If not, how to go ahead is explained in the documentation linked in to the introduction of this forum.
Otherwise the additional energy dissipation will only help to melt the arctic ice cap.
I know, this is not going to help you. Still I want to note that by running more efficient software (Linux against Windows Server, MySQL/PostgreSQL against MSSQL) you can keep the hardware requirements low.
Hardware and performance
Separate MSSQL database server?
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