問97
頻出度★☆☆
PCのCPU に関する記述のうち, 適切なものはどれか。
平成31年度 春期 ITパスポート試験 問97
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 97
- ア
正解 ア is correct. The GHz (gigahertz) in a CPU operating frequency of “1GHz” is a unit of clock frequency, indicating how many times per second the clock signal (synchronization signal), which aligns the timing of processing across circuits, is generated. Since 1G is one billion, 1GHz means the CPU works by generating the clock signal one billion times per second, so the description is accurate. The larger this value, the more processing timings there are per second, and generally the faster the processing.
Incorrectイ
The “32” and “64” are values indicating the width of data the CPU can process at once (the number of bits in its registers or data bus); they do not indicate the processing speed itself. The larger the number of bits, the more information can be handled at once, but speed is not equal to the number of bits.
Incorrectウ
The “first (L1)” and “second (L2)” indicate the order and proximity of access from the CPU core (the cache hierarchy), not the rank of capacity size. In fact, the first-level cache is smaller in capacity and faster, while the second-level cache is larger in capacity and slower, so the explanation of a rank by capacity is even backwards.
Incorrectエ
The “dual” and “quad” indicate that the number of cores (the central circuits that carry out processing) built into the CPU is 2 and 4, respectively. It is a mechanism that raises performance by dividing the processing work among multiple cores, not one that switches the CPU to an energy-saving mode reducing power consumption to 1/2 or 1/4.
ここがポイント
- Clock frequency (Hz) expresses the number of clock signals generated per second; 1GHz = one billion times per second. The larger the value, the more processing timings there are.
- Distinguishing the meanings of CPU terms: number of bits = the width of data handled at once; first/second level of cache = the access hierarchy; number of cores (dual/quad) = the count of processing circuits.
用語