Editing Hertz (section)

===Computers===
{{further|topic=why frequency is a flawed speed indicator for computers|Megahertz myth}}
In computers, most [[central processing unit]]s (CPU) are labeled in terms of their [[clock rate]] expressed in megahertz ({{val|u=MHz}}) or gigahertz ({{val|u=GHz}}). This specification refers to the frequency of the CPU's master [[clock signal]]. This signal is nominally a [[Square wave (waveform)|square wave]], which is an electrical voltage that switches between low and high logic levels at regular intervals. As the hertz has become the primary unit of measurement accepted by the general populace to determine the performance of a CPU, many experts have criticized this approach, which they claim is an [[Megahertz myth|easily manipulable benchmark]]. Some processors use multiple clock cycles to perform a single operation, while others can perform multiple operations in a single cycle.<ref>{{cite magazine|first=Amit |last=Asaravala |url=https://www.wired.com/news/business/0,1367,62851,00.html |title=Good Riddance, Gigahertz |magazine=Wired |date=2004-03-30 |access-date=2012-04-28}}</ref> For personal computers, CPU clock speeds have ranged from approximately {{val|1|u=MHz}} in the late 1970s ([[Atari]], [[Commodore International|Commodore]], [[Apple computers]]) to up to {{val|6|u=GHz}} in [[IBM Power microprocessors]].

Various [[Bus (computing)|computer buses]], such as the [[front-side bus]] connecting the CPU and [[Northbridge (computing)|northbridge]], also operate at various frequencies in the megahertz range.