The 850 Evo was a more balanced version of the benchmark-busting 850 Pro, and now it has been super-sized to become one of the largest SSDs we have ever seen. This advantage was amply demonstrated by its most recent 850-series drives that offer excellent functioning and value. Samsung leads the way at the top end of the consumer SSD market thanks to its control of every aspect of the research, design and production of its drives.



Its best functionality here came in the 4K 64 write benchmark, where its 319MB/sec pace was 8MB quicker than the 850 Pro. It also proved a few megabytes faster than the smaller 850 Evo we reviewed in early 2015. Our final test, Iometer, evaluates performance over a longer timespan, and here the 850 Evo was impressive. Its 5,961 total IO figure was better than the 2TB Pro drive, and has been outpaced by only a handful of smaller SSDs.


It is a simple producing concept that has proved effective: the individual transistors that make up the memory chips are stacked vertically as well as horizontally. The 850 Evo leaves the factory with an endurance rating of 150TB. That is the same rating as the 500GB and 1TB versions of the Evo. And it is decent, it matches the smaller 850 Pro drives. But when stacked up against the 2TB 850 Pro, it falls short that drive is rated for a mighty 300TB.

The end result is fewer electricity leaks and better functioning, since there is no need to squeeze tiny transistors into minuscule spaces. A look at the producing process illustrates the impact of 3D V-NAND, the transistors here use a more capacious 40nm producing process, while traditionally built drives rely on 20-nm or smaller processes.


The Samsung’s 2TB version of the 850 Evo offers superb capacity and it virtually matches the 850 Pro drive for speed.