The Western Digital WD Black SN750 SSD Review: Why Fix What Isn't Broken?

AnandTech Storage Bench - Heavy

Our Heavy storage benchmark is proportionally more write-heavy than The Destroyer, but much shorter overall. The total writes in the Heavy test aren't enough to fill the drive, so performance never drops down to steady state. This test is far more representative of a power user's day to day usage, and is heavily influenced by the drive's peak performance. The Heavy workload test details can be found here. This test is run twice, once on a freshly erased drive and once after filling the drive with sequential writes.

The WD Black SN750 provides only minor overall improvements over last year's model on the Heavy test. This leaves it with an average data rate that falls well short of the latest Silicon Motion-based drives when the test is run on an empty drive, but the full-drive performance of the WD Black is still excellent.

The average and 99th percentile latencies from the new WD Black are not significantly different from last year's model. The Corsair MP510 provides slightly better latency scores using the same flash, and the Silicon Motion SM2262EN-based drives are even faster when the test is run on an empty drive.

The average read and write latencies from the WD Black SN750 are a tiny bit better than the previous generation, but not enough to change the rankings significantly. The SN750 has one of the best average read latency scores for a full-drive test run, and its empty-drive read latency score comes closer to the best drives than either of its average write latency scores.

The WD Black SN750 and its predecessor show very little full-drive penalty to 99th percentile read or write latencies, and consequently they have some of the best full-drive QoS scores on the Heavy test. But when the test is run on an empty drive, several other drives score a bit better.

The SN750 is slightly more power efficient than its predecessor, bringing it very close to matching the WD Blue SATA SSD for efficiency while delivering almost three times the overall performance.