What is the minimum server specification if the database is on a different physical server?

In this case, disk space is a non issue. In terms of memory, allocate 8GB for CardioLog Pro, and 16GB for CardioLog Enterprise. 

The amount of resources needed for the CardioLog web application and services depends on:

1. The amount of traffic coming in from the portal: Each SharePoint page request if followed by a request to the CardioLog web app server.
2. The number of portal pages and users: As these grow, the amount of memory used by the CardioLog services grows too.