RDSHC planning doc
Not sure what RDSHC is, then take a look at the RDS Hosts Capacity Planning document
Remote Desktop Session Host Capacity Planning in Windows Server 2008 R2
The Remote Desktop Session Host (RD Session Host) role service lets multiple concurrent users run Windows-based applications on a remote computer running Windows Server 2008 R2. This white paper is intended as a guide for capacity planning of RD Session Host in Windows Server 2008 R2. It describes the most relevant factors that influence the capacity of a given deployment, methodologies to evaluate capacity for specific deployments, and a set of experimental results for different combinations of usage scenarios and hardware configurations.