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IOMeter — Sequential and random performance

IOMeter fuels much of our latest storage test suite, including our sequential and random I/O tests. These tests are run across the full capacity of the drive at two queue depths. The QD1 tests simulate a single thread, while the QD4 results emulate a more demanding desktop workload. For perspective, 87% of the requests in our old DriveBench 2.0 trace of real-world desktop activity have a queue depth of four or less. Clicking the buttons below the graphs switches between results charted at the different queue depths. Our sequential tests use a relatively large 128-KB block size.



The Samsung 970 EVO Plus starts off strong, with the highest sequential read and write speeds of any 500-GB class drive in our test set at QD1. Its writes are particularly noteworthy, pulling far ahead of the 760P and SX8200. At QD4, it even breaks the 3000 MB/s barrier and surpasses the 970 EVO 1 TB. Quite an auspicious start!



The 970 EVO Plus posts the fastest random read response times we've seen yet, narrowly edging out the 970 EVO 1 TB and SX8200. Its random write response times aren't as impressive, but they're respectable nonetheless.

The 970 EVO Plus hasn't let us down yet. It's faster than similarly sized PCIe drives and even trades blows with larger ones at times. Time for more rigorous tests.