Before moving first let us discuss about the term scalable. Scalability is the capability of the system to opt the changes according to the plan when load increases on the server without allowing server to go in downtime.
Dedicatd server provides us the facility of scalability by providing changes in resources as per our requirement such as RAM, STORAGE or CPU that can provide better performance of the system.It is the main advantage of dedicated server that we can configure server according to our changing requirement.