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There's no way to be certain of the performance requirements without knowing a lot more about your application and/or testing (which you'll want to do anyway) but certainly any modern correctly-configured server should be able to handle the SSL and static content at that level easily (something like a HP DL3x0 Gen8 or IBM/Dell equivalent), whether your application can keep up is going to be a mystery but if it's not too complex then I'd suggest that you're probably going to be just fine with that class of machine.

The trick is to leave yourself another 'gear' that you can quickly change into if needed, so for instance if you think you'd be fine with a single CPU then get the most cores on one CPU and leave the second or subsequent CPU slot free - that way you can simply add a new CPU (you may have to modify memory layout too) and you get a healthy performance increase for say $£1k without having to make any architectural changes. If you have a single CPU slot server you don't have this easy option. Obviously if you're using VMs this is whole lot easier still.

Also if you're planning on this first server providing two or more services then I'd create CNAMEs in your DNS structure to refer to each service right away from the start. That way your web service can point to your application services which in turn can point to your database services. On one machine this makes no difference but if you have to add say a dedicated application or database server you just need to build the server with the appropriate DNS name, migrate your data and switch off that service on the original machine, there'll be no other changes required to point to the second dedicated server - does that make sense?

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