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 upgrade on the machine includes a boost to the system bus--the primary pathway between the central processing chip and the computer's memory, from 100 MHz to 133 MHz.

FORBES: Apple Speeds Up The Powerbook

UK-based computer chip designer Imagination Technologies is buying US central processing unit (CPU) architect Mips's business operations and some of its patents.

BBC: Imagination challenges ARM with Mips takeover