We always felt the need of Hardware capacity guidance and sizing information for Terminal Services or Remote Desktop services for Server 2008 R2, Whenever I am engaged in any architectural guidance discussion for RDS deployment i always get a question what needs to be taken into consideration while deciding the hardware configuration and to do capacity planning.
Here are some bullet points which I recommend to my partners and customers to consider:
In addition to that, Microsoft has just released a whitepaper on Capacity Planning in Windows Server 2008 R2.
Download it here
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.
You can also use this document for sizing Terminal Services on a Hyper V Platform
Also use the Remote Desktop Load Simulation Tools available at following link to do the load testing for number of users on RDS Server
I hope it helps, Let me know if you have any questions.
Is this being generous to the user or doing the bare minimum?
I've always aimed to give them at least 128MB RAM each and even then it can require more even for some office apps.
Dan, 64MB is memory which i recommended is for Applications like Microsoft dynamics GP ONLY, more memory would be needed for additional apps like Office.