問63
頻出度★☆☆
CPUのクロック周波数に関する記述のうち, 適切なものはどれか。
平成27年度 秋期 ITパスポート試験 問63
テクノロジ系コンピュータ構成要素 › プロセッサ
This question's explanation and your answers so far.
解説
問 63
Incorrectア
Even at the same clock frequency, a 32-bit CPU and a 64-bit CPU handle different data widths at once (register and bus width), so their performance is not necessarily equal. Performance is determined not only by clock frequency but also by bit width, number of cores, architecture, and other factors, so this is wrong.
- イ
正解 Clock frequency is the number of times per second of the signal (the clock) that the CPU uses to keep the pace of its operations, measured in Hz. For CPUs of the same type, the higher the clock frequency, the more the internal circuits switch per unit of time, so power consumption rises; since that power is released almost entirely as heat, the amount of heat also increases. When heat becomes excessive it can cause malfunctions or failures, so heat-dissipation measures such as heat sinks and fans become important. Therefore “イ” is appropriate.
Incorrectウ
A CPU's clock frequency represents the internal operating speed of the CPU, whereas the network transfer rate is determined by the line standard and the communication environment; they are separate things. There is no direct proportional relationship between the two, so this is wrong.
Incorrectエ
Even in a multi-core processor, each core operates according to the clock, so when the clock frequency rises, the processing capability per core also improves. Processing capability depends on both the number of cores and the clock frequency, so saying it “does not depend on clock frequency” is wrong.
ここがポイント
- Clock frequency is the number of times per second of the signal that sets the pace of the CPU's operations (unit: Hz); the higher it is, the faster the processing, but power consumption and heat also increase, requiring heat-dissipation measures.
- A CPU's performance is not determined by clock frequency alone; it is determined comprehensively by multiple factors such as bit width (32/64), number of cores, and architecture.
用語