Samsung SSD 850 Evo review:

Top performance for a low price

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4.5 stars

CNET Editors' Rating

The Good The Samsung SSD 850 Evo delivers great performance with useful features, at an affordable price. The drive is available with up to 2TB of storage space.

The Bad The drive carries a 5-year warranty instead of the 10 years the Pro model offers. The Samsung Magician software only works with Windows.

The Bottom Line The Samsung 850 Evo has the best combination of performance, cost and capacity, making it the ideal drive for any home user.

8.8 Overall
  • Setup 8.0
  • Features 9.0
  • Performance 9.0
  • Support 9.0

Editors' note: This review was updated on July 6, 2015, when the 2TB capacity of the drive was released.

If you've been eyeing the Samsung SSD 850 Pro but can't quite afford it, the 850 Evo is an excellent alternative. Actually, it may even be the better choice, especially since it's the cheaper of the two, while still achieving fast -- although not consistently as fast as the 850 Pro -- performance.

Though officially an upgrade to the Samsung SSD 840 Evo, the new drive shares more in common with the higher-end 850 Pro. In my testing, the drive achieved impressively zippy speeds, especially in the performance-boosting RAPID mode. Also, I didn't experience any bugs or installation issues.

There's not much to complain about the drive except that its Samsung Magician software, which is required for RAPID mode and other features, is available only for Windows. That means other platforms, such as Mac, Linux or game consoles, won't be able to take advantage of most of the drive's features.

That said, with the current price of $65, $100, $165, $374 and $800 for 120GB, 250GB, 500GB, 1TB, and 2TB, respectively, the Samsung SSD 850 Evo is an easy recommendation for any home users who want to add a huge performance boost to their computer. (Note that cost of the 2TB is the suggested retail price, its street price will likely be lower.)

For more options, however, check out this list of top standard SSDs on the market.

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The new 2TB Samsung SSD 850 Evo solid-state drive. Josh Miller/CNET

High endurance with 3D NAND

Following the 850 Pro, the 850 Evo is the second SSD from Samsung that uses a 3D vertical flash memory cell. Traditionally, 2D planar type NAND flash memory cells -- the storage units on an SSD -- lay flat on the surface of the silicon wafer. That's common for most SSDs on the market. With the 850 Evo, the drive's flash memory cells are stacked in up to 32 layers, which allows for significantly more cells in the same number of wafer bits. This greatly increases the density and means, among other things, more storage space for less cost.

Similar to the 850 Pro, Samsung also claims that the 3D NAND delivers very high endurance, which is the rating that quantifies the total amount of data that can be written to an SSD before the drive becomes unreliable.

Specifically, the 850 Evo's 120GB and 250GB capacities have an endurance rating of 75TB. This means you can write 40GB per day to the drive every day, and it will last for at least 5 years. The 500GB, 1TB and 2TB capacities' endurance is doubled (150TB) and will take even longer to run out.

Note that SSD's endurance relates only to writing as reading doesn't effect its life span at all. (For more on SSD's endurance, check out this post.) Also, 40GB is a lot of data; in general usage, most days we don't write even a fraction of that to our computer's main drive. That said, chances are you'll replace your computer a few times before the 850 Evo's endurance is expired.

Samsung SSD 850 Evo specs

Capacities 120GB 250GB 500GB 1TB 2TB
Design 2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm 2.5-inch 7mm
Controler Samsung MGX Controller Samsung MGX Controller Samsung MGX Controller Samsung MEX Controller Samsung MHX controller
Flash memory Samsung 3D V-NAND 3bit MLC Samsung 3D V-NAND 3bit MLC Samsung 3D V-NAND 3bit MLC Samsung 3D V-NAND 3bit MLC Samsung 3D V-NAND 3bit MLC
Included Cache 256MB 512MB 512MB 1GB 2GB
Sequential Read 540 MB/s 540 MB/s 540 MB/s 540 MB/s 540 MB/s
Sequential Write 520 MB/s 520 MB/s 520 MB/s 520 MB/s 520 MB/s
Random Read 94K IOPS 97K IOPS 98K IOPS 98K IOPS 98K IOPS
Random Write 88K IOPS 88K IOPS 90K IOPS 90K IOPS 90K IOPS
Power consumtiion (idle) 2mW 2mW 2mW 4mW 5mW
Power consumption (read | write) 3.7W|3.7W 3.7W|3.7W 3.7W|3.7W 3.7W|3.7W 3.7W | 4.7W
Endurance (Terabyte written, at least) 75TB 75TB 150TB 150TB 150TB
Warranty 5-year 5-year 5-year 5-year 5-year

Otherwise, the 850 Evo looks just like a 850 Pro or the 840 Evo. It's a standard 2.5-inch internal drive that's 7mm thick. The drive supports SATA 3 (6Gbps) but will also work with SATA 2 and the original SATA.

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The standard internal drive supports SATA 3 (6Gbps) and is only 7mm thick. Josh Miller/CNET

TurboWrite and RAPID mode

Similar to the case of the 840 Evo, the new 850 Evo supports TurboWrite technology. In a nutshell, TurboWrite enables the drive to operate a portion of its flash memory in a simulated high-performance mode of single-layer-cell flash memory, often found in expensive enterprise SSDs, as a buffer zone. During write operations, data from the host system is first transferred/written to this buffer zone at high speeds and then during the idle periods, the data is moved from the buffer to primary storage region. This results in much faster write performance from the user's perspective.

TurboWrite Technology works within the drive automatically so you don't need to enable it. You do need to manually enable RAPID, however, which Samsung first introduced in the 840 Pro.

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