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

The NOR type needs to be ultrafast because it is directly connected to the central processing unit of a computer and stores its basic input-output system (the operating system used by the microchip that lies beneath user-interface operating systems, such as Windows).

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Taking advantage of cheaper processing power, the rise of new computer languages and the increasing urgency of the problem, these companies' own complex software seeks flaws in programming grammar, reverse-engineers applications to see that they do what they're supposed to and emulates the malicious hacks they will face once they're put in use.

FORBES: Magazine Article