The difference between a managed dedicated server and an unmanaged (sel-managed) dedicated server boils down to a number of things including price. A managed dedicated server cost more with a better level of support from the web hosting company. It is more than just basic service. Both are leasing situations, meaning most service providers offer managed dedicated servers to their clients, in addition to unmanaged servers. The basic definition is that a managed dedicated server is a hands on situation by the web hosting company. The other is not.