Which of the following components normally provides the fastest data-access speeds (lowest latency and highest throughput) for the CPU in a personal computer?
SATA solid-state drive (SSD)
7200-RPM hard disk drive (HDD)
Random-access memory (RAM)
NVMe solid-state drive (SSD)
RAM (system memory) operates on the memory bus and can satisfy read requests in tens of nanoseconds, whereas even the fastest NVMe SSDs respond in tens to hundreds of microseconds. SATA SSDs and mechanical hard drives are progressively slower still. Because of this large speed gap, the CPU relies on RAM-not storage drives-for the data it needs to process quickly.
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