Aug 12, 2013 · New features in Cisco 3750-X and 3560-X comparing with 3750-E and 3560-E series • Cisco StackPower technology, available only on the Cisco Catalyst 3750-X, manages power very efficiently by aggregating and sharing power supplies across a stack of switches. It also supports a feature known as Zero-Footprint RPS. WS-C3750X-48PF-S switches also provide users with a huge amount of control over their hardware configuration. 3750-X switches have with dual modular power supplies and fans, Cisco’s 64 Gbps StackWise Plus technology, stack-power support, and an optional uplink module for adding 1G / 10G ports.
Cisco Catalyst WS-C3560X-48T-S switch - 48 ports - managed - rack-mountable Series. The Cisco® Catalyst® 3750-X and 3560-X Series Switches are an enterprise-class lines of stackable and standalone switches, respectively.