SSD Benchmark Guide: Test and Interpret Results

Written and maintained by Joseph James Stahl · DriveMetric Guide

A practical framework for understanding SATA and NVMe SSD benchmark results.

Benchmark the right question

Peak sequential throughput, low-queue-depth random access and sustained write speed answer different questions. Decide which workload matters before deciding whether a result is “good.”

SATA has an interface ceiling

Modern SATA SSDs can approach the practical limits of SATA 6 Gb/s in sequential transfers. Seeing results well below an NVMe drive does not automatically indicate a problem; the interface itself is different.

Cache changes write results

Many SSDs use fast cache regions. Short writes may stay inside cache and look very fast, while long sustained writes can fall to the underlying NAND speed after the cache fills.

Free space matters

Nearly full SSDs can have less room for cache and background garbage collection. When comparing results, note drive capacity and free-space conditions.

Repeatable procedure

1. Close heavy applications.
2. Record drive temperature.
3. Use the same profile each time.
4. Run multiple passes.
5. Let the drive cool and idle if testing thermal or cache effects.