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Keep in mind, because the frontend & backend can be run on separate servers, you can split this memory across two (or more) servers.  You can even choose to run PostgreSQL or Solr either alongside the backend or on their own dedicated server.

DSpace does not normally require large amounts of CPU. However, you likely will either want to run the frontend/backend on separate servers (therefore separate CPUs), or have a single server with ~4 CPU cores (at a minimum). Again, highly active sites may require additional CPU power (especially for the frontend and for any batch processing / command line scripts on backend).

Performance Tuning the Frontend (UI)

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