![]() ![]() It may lack hardware-based encryption, but based on its responsive performance, software support, five-year warranty, and competitive prices, it earns a solid recommendation from us. The WD Black SN770, on the other hand, is priced much more aggressively, so it isn't out of reach of the masses. SSDs such as the Kingston KC3000/Fury Renegade, WD Black SN850, and Samsung 980 Pro all deliver top-ranking performance, but they have hefty prices that hurt their value proposition. Not to mention beating the SN570, SN750, and SN750 SE across the board. ![]() So much so that the SN770 not only traded blows with the SN850, but it also beat Crucial’s P5 Plus and Samsung 980 Pro in both gaming and application workloads. Sure, it doesn’t deliver top-ranking sequential performance, but the firmware and SLC cache are extremely well-tuned. And while the company’s Black SSDs have traditionally leveraged a more complex DRAM-based design to provide the utmost performance, the company’s newest drives have been surprising creations, to say the least.Īlthough the WD Black SN770’s lacks DRAM and is outfitted with half the NAND channels as many of its competitors and predecessors, it blazed through our testing, performing like one of the best SSDs we’ve ever come across. To some, WD’s Black SSDs have come to represent the pinnacle of performance for gaming and professional workloads alike. Remember that results will vary based on the workload and ambient air temperature. data and an IR thermometer to see when (or if) thermal throttling kicks in and how it impacts performance. 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. 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 as even the best Ultrabooks can have mediocre storage. We use the Quarch HD Programmable Power Module to gain a deeper understanding of power characteristics. We also noticed that in each idle round write pass the write speed would not degrade to such lows as 560 MBps but rather to a higher average of 1.5 GBps. It evacuated its SLC cache at a rate of roughly 30GB per every minute of idle. When given time to idle and recover, the SN770 did so quickly. After the SLC cache saturated, the SN770 wrote at roughly 560 MBps for the remainder of the test. Our 1TB sample absorbed roughly 377GB of data at a rate of 4,850 MBps before it degraded. However, it is better suited to consumer workloads and recovers quickly. The SN770's sustained write performance wasn't quite as good as the original SN750's due to its four NAND channels, lack of DRAM, and fully dynamic SLC cache. Unlike the SN750 SE, the SN770 doesn't exhibit strange write behavior when we tested with iometer - the cache size and degraded-state write behavior was the same as when dragging and dropping files onto the SSD. We also monitor cache recovery via multiple idle rounds. 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 While the SN770 delivered a solid result with Game Mode disabled, enabling Game Mode propelled the SN770’s 4KB QD1 random read performance ahead of both the Kingston KC3000 and WD Black SN850, ranking second to the Samsung 980 Pro. ![]() Random performance was very impressive, too. On the other hand, in Crystal Disk Mark, the SN770 delivered the fastest 1MB Queue Depth (QD) 1 read result and the third-fastest write result. The WD Black SN770 delivered solid sequential performance across most block sizes, but slowed around the 1MB mark in ATTO.
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