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

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ca837962-4128-4680-b1c0-ad0985939063

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.

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