Performance Focus – Western Digital WD Black NVMe 1TB SSD

I'm sticking with the 'burst vs. saturated' plots here, as they do well to show both sustained performance and the more realistic (for client PC usage) burst throughputs. Caching SSDs turn in vastly different results for the two methods, especially for writes, as shown below.

Sequential

Random

Burst Random %Read Sweep

Caching

We caught some odd behavior during our caching test. Let's zoom out a bit to the full run:

Note that the pattern repeats consistently across the board. While this is a relatively simple sequence, something about the Spectrum controller's nCache method did not mesh nicely with it. While we can't give our usual quick temperature reading on the size of the SLC cache given these results, if you scroll back to the top chart on this page, you'll see that there is a definite difference between burst and sustained writes, indicating that there is definitely a cache layer at play here and that it is functioning when it really needs to.

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