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- Megahertz_myth abstract "The megahertz myth, or less commonly the gigahertz myth, refers to the misconception of only using clock rate (for example measured in megahertz or gigahertz) to compare the performance of different microprocessors. While clock rates are a valid way of comparing the performance of different speeds of the same model and type of processor, other factors such as pipeline depth and instruction sets can greatly affect the performance when considering different processors. For example, one processor may take two clock cycles to add two numbers and another clock cycle to multiply by a third number, whereas another processor may do the same calculation in two clock cycles. Comparisons between different types of processors are difficult because performance varies depending on the type of task. A benchmark is a more thorough way of measuring and comparing computer performance.The myth started around 1984 when comparing the Apple II with the IBM PC. The argument was that the PC was 5x times faster than the Apple, as its Intel 8088 processor had a clock speed roughly 5x the clock speed of the MOS Technology 6502 used in the Apple. However, what really matters is not how finely divided a machine's instructions are, but how long it takes to complete a given task. Consider the LDA # (Load Accumulator Immediate) instruction. On a 6502 that instruction requires two clock cycles, or 2 μs at 1 MHz. Although the 4.77 MHz 8088's clock cycles are shorter, the LDA # needs 4 of them, so it takes 4 / 4.77 MHz = 0.84 μs. So that instruction runs only a little more than 2 times as fast on the original IBM PC than on the Apple II.".
- Megahertz_myth wikiPageExternalLink mhz_myth_320f.mov.
- Megahertz_myth wikiPageExternalLink story.php?news_id=3997.
- Megahertz_myth wikiPageExternalLink intel_cancels_tejas.
- Megahertz_myth wikiPageID "2093258".
- Megahertz_myth wikiPageRevisionID "606002951".
- Megahertz_myth hasPhotoCollection Megahertz_myth.
- Megahertz_myth subject Category:Clock_signal.
- Megahertz_myth subject Category:Microprocessors.
- Megahertz_myth subject Category:Misconceptions.
- Megahertz_myth type Artifact100021939.
- Megahertz_myth type Chip103020034.
- Megahertz_myth type Conductor103088707.
- Megahertz_myth type Device103183080.
- Megahertz_myth type Instrumentality103575240.
- Megahertz_myth type Microprocessor103760310.
- Megahertz_myth type Microprocessors.
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- Megahertz_myth comment "The megahertz myth, or less commonly the gigahertz myth, refers to the misconception of only using clock rate (for example measured in megahertz or gigahertz) to compare the performance of different microprocessors. While clock rates are a valid way of comparing the performance of different speeds of the same model and type of processor, other factors such as pipeline depth and instruction sets can greatly affect the performance when considering different processors.".
- Megahertz_myth label "Megahertz myth".
- Megahertz_myth label "Mythe du mégahertz".
- Megahertz_myth label "Миф о мегагерцах".
- Megahertz_myth sameAs Mythe_du_mégahertz.
- Megahertz_myth sameAs m.06lnk1.
- Megahertz_myth sameAs Q2495304.
- Megahertz_myth sameAs Q2495304.
- Megahertz_myth sameAs Megahertz_myth.
- Megahertz_myth wasDerivedFrom Megahertz_myth?oldid=606002951.
- Megahertz_myth isPrimaryTopicOf Megahertz_myth.