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Samsung 970 EVO Plus SSD Review: More Layers Brings More Performance
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Quote:Our Verdict

With better performance, efficiency, and lower MSRPs, Samsung’s 970 EVO Plus is a big "plus" in almost every way over its predecessor. It rivals its bigger brother, the 970 PRO, and comes with a complete software suite, making the Samsung 970 EVO Plus a great buy.

For

Solid overall performance
Black PCB
Excellent software package

Against

Could use further efficiency optimization

Samsung's 970 EVO Plus replaced the ever-popular 970 EVO as its mainstream NVMe SSD for tech enthusiasts, hardcore gamers, and professionals. Samsung equipped the SSD with V5 flash, which provides a nice bump in performance up to 3.5 GB/s of sequential read throughput. The drive also boasts hardware encryption support, a five-year warranty, and up to 1,200 TBW of endurance. Overall, the 970 EVO Plus is one of the fastest SSDs we've tested, so it easily gains our recommendation.

Though at press time, the 970 EVO didn't quite outpace the competition and make our best SSDs list, it's an excellent drive and very worthy of your consideration. That's particularly true if you're looking for greater endurance than more budget-friendly competitors like the Adata XPG SX8200 Pro.

The 3D NAND craze began in 2013. Since then, it has been a race to see who can push the layers the highest, deliver the highest density, and, of course, offer the best performance. Last year, IMFT (Intel/Micron), Flash Forward (Toshiba/SanDisk), and SK Hynix all announced their 96-layer NAND that offers improved speed and density over 64-layer parts.

Unlike their competitors that have already announced 96-layer 3D NAND, Samsung hasn’t announced the exact number of layers in its V5 V-NAND. That's strange given the company's typical transparency and in-depth performance and hardware specifications.

Samsung does say that its latest 9x-layer flash operates at much faster speeds than its 64-layer predecessor and features a low 1.2V I/O rating. The new flash also supports the Toggle 4.0 interface, operates at 1.4GT/s, and comes with a 256Gb die density for the 250GB, 500GB, and 1TB 970 EVO Plus models. A 2TB model will come later, bringing with it a 512Gb die.

The new 9x-layer V-NAND, combined with the 970 EVO Plus's firmware optimizations, improves random write performance significantly and gives the SSD a slight boost in random read performance, too. Sequential write speeds also increased by 800MB/s.

Samsung’s 970 EVO Plus can dish out up to 3.5GB/s of sequential read performance and up to a staggering 3.3GB/s write. It also delivers up to 620,000/560,000 random read/write IOPS.

The 970 EVO Plus's write performance varies based on how much data lands in the TurboWrite cache, which is a small section of faster SLC-programmed flash that's used to boost performance. Samsung's EVO Plus has both a default TurboWrite cache capacity, which doesn't change regardless of conditions, and an Intelligent TurboWrite region that varies in size depending on the model and the amount of free space on the drive.

For instance, the 1TB model provides 6GB of TurboWrite capacity. Beyond that, Intelligent TurboWrite steps in and scales up to an additional 36GB if you have enough free space on the drive.

Given the limited size of the TurboWrite cache, some large file transfers and workloads will land in the slower TLC flash. Even with the new NAND interface operating 40 percent faster than it did with V4 V-NAND, direct-to-TLC writes are still slower than the Intelligent TurboWrite region. But Samsung also improved the write performance of the TLC flash, which helps reduce the impact in those conditions. Samsung provides performance specifications for both TurboWrite and "after TurboWrite" performance, as listed in the chart above.
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