問75
頻出度★☆☆
CPUの性能に関する記述のうち, 適切なものはどれか。
平成29年度 秋期 ITパスポート試験 問75
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 75
Incorrectア
This is the opposite. The number of bits represents the data length a CPU can handle at one time, and the larger the number, the larger the length. A 64-bit CPU can handle a larger data length at one time, so the statement that the 32-bit CPU is larger is wrong.
Incorrectイ
This is the opposite. Cache memory is high-speed memory that takes over accesses to the slow main memory; the larger its capacity (suitably large), the more easily the needed data fits in the cache, so main-memory accesses decrease and processing speed improves. The claim that a smaller capacity is faster is wrong.
- ウ
正解 The correct answer is ウ. The clock frequency of a CPU represents the number of processing timings (clock signals) it ticks per second, measured in Hz. For CPUs of the same structure (architecture), the amount of work done per clock is roughly the same, so the higher the clock frequency, the more instructions can be executed per second and the higher the processing speed. Therefore ウ is correct.
Incorrectエ
This is the opposite. The more cores (the computational core units) a CPU has, the more processing it can execute in parallel. A quad-core (4 cores) can execute a larger number of processes simultaneously than a dual-core (2 cores). So the statement that the dual-core is larger is wrong.
ここがポイント
- Clock frequency (Hz) represents the number of clocks per second; for CPUs of the same architecture, the higher it is, the higher the processing speed.
- CPU performance is determined by the number of bits (a larger data length handled at once is more advantageous), cache capacity (larger is more advantageous), and the number of cores (more cores means more parallel processing); note that for all of them, a larger value means higher performance.
用語