But at higher queue depths, it is obviously the most efficient NAND-based SSD we've tested for random reads. But the Silicon Motion SM2262EN drives are faster at all queue depths, though not in proportion to how much more power they require.Īt low queue depths the random read performance of the WD Black SN750 is down in SATA performance territory where some drives can beat it on performance and power consumption. When the WD Black SN750 is pitted against most of last year's competition, it does at least catch up if not pull ahead in random read performance at higher queue depths, while never requiring as much power. The WD Black SN750 is just a touch more efficient than its predecessor on the random read test, allowing it to retake a small lead among TLC-based drives here rather than being in a tie with the Toshiba XG6. On the longer random read test that also brings in some higher queue depths, the WD Black SN750 is still quite a bit slower than the best combinations of Silicon Motion controller and Micron NAND, but at least this time the drives that use the same Toshiba/SanDisk BiCS3 NAND with different controllers aren't so far ahead of the WD Black.
The individual read operations are again 4kB, and cover a 64GB span of the drive. After each queue depth is tested, the drive is given up to one minute to cool off so that the higher queue depths are unlikely to be affected by accumulated heat build-up. Each queue depth is tested for one minute or 32GB of data transferred, whichever is shorter. Our sustained random read performance is similar to the random read test from our 2015 test suite: queue depths from 1 to 32 are tested, and the average performance and power efficiency across QD1, QD2 and QD4 are reported as the primary scores. The SN750 is insignificantly faster than last year's model, but both the Plextor M9Pe and Corsair MP510 get better read latency out of this NAND by pairing it with different controllers. The Toshiba/SanDisk 3D NAND has consistently shown worse burst random read performance than its competition, and the WD Black SN750 does nothing to change that pattern.
Each burst consists of a total of 32MB of 4kB random reads, from a 16GB span of the disk. The drives are given enough idle time between bursts to yield an overall duty cycle of 20%, so thermal throttling is impossible. Our first test of random read performance uses very short bursts of operations issued one at a time with no queuing.
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