According to the Citrix Virtual Apps and Desktops 7 Deployment and Administration course, a license upgrade is a cost effective solution that allows an administrator to increase the performance of an existing Citrix ADC appliance without replacing the hardware. A license upgrade can provide more throughput, SSL transactions per second, and compression capability. In this scenario, a license upgrade from MPX 5550 to MPX 5650 can double the throughput and SSL transactions per second, which can handle the forecasted growth of the retail company1
1: Citrix Virtual Apps and Desktops 7 Deployment and Administration (CWS-215), Module 6: Citrix ADC High Availability, Lesson: Citrix ADC Optimization, Topic: Citrix ADC Optimization Overview, Slide 6.