For a minimal installation, for instance to see a sample install of the application and with the DB and application on a single machine, 4 GB or more is strongly recommended and a 64 bit OS is required. Quad core or better hardware is also strongly recommended. For production installs please see this page for more detailed hardware recommendations for application servers and database servers.
If the machine will be hosting other web sites or applications besides Journyx then the system resources will need to be increased appropriately. If you have any questions please email support@journyx.com
You should also know that Journyx provides Journyx in a Cloud or Saas (Software as a Service) model where the application is hosted on Journyx servers and accessed through a secure SSL internet connection. If hardware resources or system administration resources are a concern then you might want to discuss this option with your Journyx sales representative and have Journyx take care of all of this!