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What is the real-life difference between 5200 and 7200 HDD RPM?



Mean rotational latency for a 5,400 RPM hard disk drive = 5.55ms

Mean rotational latency for a 7,200 RPM hard disk drive = 4.16ms

The mean seek latency is independent from the rotational latency but it tends to be higher on lower RPM hard drives as they are typically designed for power efficiency.

All in all, the jump from a 5,400 RPM hard disk drive to an equivalent 7,200 RPM hard disk drive is quite substantial in performance alone, without getting into differences between 7,200 RPM hard disk drives themselves. You will notice a large difference in throughput between a Western Digital Green (nominally ~5,400 RPM) and a Western Digital Blue (nominally ~7,200 RPM) and a modest difference in throughput between a Western Digital Blue and a Western Digital Black (nominally ~7,200 RPM, but includes more powerful mechanical components and a more advanced hard disk controller).

The benefit to gaming is most evident in load times, but in games that like to stream assets straight from the storage media rather than store them in memory (a common memory management technique popularized by poor console ports) the impact will be more profound.