If you have been following IBM's recent announcement of Innovator-C, a free version of Informix for all supported platforms that can be used in production environments, you may have seen a list that looks something like this:

Maximum of 4 CPUVPs
Maximum of 2GB memory allocated to Informix
Maximum of 2 Enterprise Replication Admin nodes
1 Read/Write HDR Server or 1 Read/Write RSS Server