How many client i able to host in this server?

[Cory]

Space is calculated by 1024.
Bandwidth is calculated by 1000. (Some hosts do use 1,024)

100 Mbps = 12.5 MB/s

12.5 MB/s * 1000 = 12,500 Kbps / 512 Kbps (Dedicated per User) = 24 Users (Rounded to 25 Users)

Since any given user won't be using it all the time, I would say with 'Config Server 2' you can easily double that has it's shared, so as others have mentioned. 40-50 Users.