How many clients can be supported by 1 SIC server - we have 23000+ clients spread out - can I use 1 SIC server or do I need a dedicated SIC server for each of the sites I have GUP's?

I would ideally like to use 1 SIC that goes out to the internet to check and not have multiple SIC's that require internet access due to security concerns.Also, does the SIC have to be a dedicated server or can it share the function with SEPM?

Network-based Shared Insight Cache - Best Practices and Sizing guide

SIC is used when you have Vms and you save scan time between them.

The SIC feature is designed for use in highly homogenous, virtualized environments. It is considered best practice to utilize this feature only in such environments. Network-based SIC may be implemented for physical clients if desired, but the network impact may outweigh the potential I/O bandwidth gains.

http://www.symantec.com/business/support/index?page=content&id=TECH174123