CentriQS requires minimum 1 GB of RAM for Server Application and minimum 1GB of RAM for Client Application.
For example, if you test CentriQS on your computer, you install both Client and Server Application on your computer, so you need about 3.5 GB of RAM in total: 1.5 GB for Operating System + 1 GB for CentriQS Server Application + 1 GB for CentriQS Client Application.
Note If you are going to use multiple databases that will be used at the same time, you need more RAM for Server Application.