The megahertz number so often cited in the marketing materials of computer companies refers to the computer's central processing unit chip as a partial measure of its ability to process data.

FORBES: Silicon Confusion

Today the increased processing power of mobile devices as well as more ubiquitous network connectivity and the ability of data centers to provide (almost) always available storage capacity and applications, are causing a return to thin client computers accessing larger shared processing and storage resources.

FORBES: Changing Digital Storage Requirements for Clouds and Mobile Devices