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We also monitor the drive’s temperature via the S.M.A.R.T. A drive might consume more power during any given workload, but accomplishing a task faster allows the drive to drop into an idle state more quickly, ultimately saving energy.
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Average workload power consumption and max consumption are two other aspects of power consumption, but performance-per-watt is more important. Some SSDs can consume watts of power at idle while better-suited ones sip just milliwatts. Idle power consumption is an important aspect to consider, especially if you're looking for a laptop upgrade. We use the Quarch HD Programmable Power Module to gain a deeper understanding of power characteristics. This propelled it well ahead of the competition up until roughly the five-minute mark, but it gave way to Samsung’s top drives along with Intel’s Optane 905P beyond that. From empty, our 1TB sample filled within 10 minutes, writing 300GB of data at a rate of 5.5 GBps before degrading to an average rate of 1.34 GBps. WD’s nCache 4.0 enables massive dynamic SLC cache capacity while also maintaining consistent QoS by using a small and quick-to-recover static cache. We also monitor cache recovery via multiple idle rounds.
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We use iometer to hammer the SSD with sequential writes for 15 minutes to measure both the size of the write cache and performance after the cache is saturated. Sustained write speeds can suffer tremendously once the workload spills outside of the cache and into the "native" TLC or QLC flash. Most SSDs implement a write cache, which is a fast area of (usually) pseudo-SLC programmed flash that absorbs incoming data. Official write specifications are only part of the performance picture. Sustained Write Performance and Cache Recovery Even scaling up to a QD of 128 the WD shows strong read and write performance, scoring first or second place in most metrics. In terms of random performance, WD’s Black delivers top-notch results with read latency clocking in at 0.048ms, roughly 21K IOPS at a QD of 1. When bumping up the queue depth, peak sequential results clocked in at 7.1/5.2 GBps read/write with a 128KB block size, and write speed increased to just over 5.5 GBps when we increased the block size to 1MB. WD’s Black SN850 delivers competitive sequential performance that even eclipses the test pool’s results at some file sizes, especially its write capability. We tested WD’s Black SN850 at a queue depth (QD) of 1 as it represents most day to day file access at various block sizes.