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The clock rate of the first generation of computers was measured in hertz or kilohertz (kHz), the first personal computers (PCs) to arrive throughout the 1970s and 1980s had clock rates measured in megahertz (MHz), and in the 21st century the speed of modern CPUs is commonly advertised in gigahertz (GHz).
The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. Sold for US$60 (equivalent to $450 in 2023 [2]), it was the first commercially produced microprocessor, [3] and the first in a long line of Intel CPUs.
The maximum officially supported Ø2 (primary) clock speed is 14 MHz when operated at 5 volts, indicated by the –14 part number suffix (hobbyists have developed 65C02 homebrew systems that run faster than the official rating).
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Without knowing the clock frequency it is impossible to state if one set of timings is "faster" than another. For example, DDR3-2000 memory has a 1000 MHz clock frequency, which yields a 1 ns clock cycle. With this 1 ns clock, a CAS latency of 7 gives an absolute CAS latency of 7 ns. Faster DDR3-2666 memory (with a 1333 MHz clock, or 0.75 ns ...
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Processors began to have a front-side bus (FSB) clock speed used in communication with RAM and other components. Typically, the processor itself ran at a clock speed that was a multiple of the FSB clock speed. Intel's Pentium III, for example, had an internal clock speed of 450–600 MHz and an FSB speed of 100–133 MHz.
The bill, aimed at reducing traffic deaths, would have mandated that vehicles beep at drivers when they exceed the speed limit by at least 10 mph (16kph). The European Union has passed similar legislation to encourage drivers to slow down. California's proposal would have provided exceptions for emergency vehicles, motorcycles and motorized ...