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Finally, tasks required of modern computers often emphasize quite different components, so that resolving a bottleneck for one task may not affect the performance of another. For these reasons, upgrading a CPU does not always have a dramatic effect. The concept of being CPU-bound is now one of many factors considered in modern computing ...
An implication of Amdahl's law is that to speed up real applications which have both serial and parallel portions, heterogeneous computing techniques are required. [12] There are novel speedup and energy consumption models based on a more general representation of heterogeneity, referred to as the normal form heterogeneity, that support a wide ...
System designers building parallel computers, such as Google's hardware, pick CPUs based on their performance per watt of power, because the cost of powering the CPU outweighs the cost of the CPU itself. [2] Spaceflight computers have hard limits on the maximum power available and also have hard requirements on minimum real-time performance.
A 1982 Osborne Executive portable computer, with a 4 MHz 8-bit Zilog Z80 CPU, and a 2007 Apple iPhone with a 412 MHz 32-bit ARM11 CPU; the Executive has 100 times the weight, almost 500 times the volume, approximately 10 times the inflation-adjusted cost, and 1/100th the clock frequency of the smartphone.
For the original NMOS design, the specified upper clock-frequency limit increased successively from the introductory 2.5 MHz, via the well known 4 MHz (Z80A), up to 6 MHz (Z80B) and 8 MHz (Z80H). [ 31 ] [ 32 ] The NMOS version has been produced as a 10 MHz part since the late 1980s.
Availability measurement is subject to some degree of interpretation. A system that has been up for 365 days in a non-leap year might have been eclipsed by a network failure that lasted for 9 hours during a peak usage period; the user community will see the system as unavailable, whereas the system administrator will claim 100% uptime.
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The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. [2] It is the last 8-bit microprocessor developed by Intel. It is software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features.