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Samsung 850 Evo 250GB review



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Samsung 850 Evo
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Our Score:



  • Consistent, fast read and write speeds
  • Cheaper than 850 Pro
  • Decent warranty


  • 850 Pro drive is faster still
  • Lesser endurance rating
  • No extras included

Key Features

  • 250GB capacity (233GB formatted)
  • 7mm form factor
  • SATA 3 interface
  • 5yr RTB warranty
  • Manufacturer: Samsung
  • Review Price: £110.00

What is the Samsung 850 Evo?

Samsung is a market leaders when it comes to SSD performance, and its flagship 850 Pro ratcheted the bar even higher. It offered stonking speed, and provided ample evidence that controlling the research, development and production of a drive provides the best results.

The 850 Evo isn’t a flagship drive, but it’s just as intriguing as the Pro version. For starters, it uses the innovative 3D V-NAND that made its debut in the Pro and, despite the high-end technology on show, it’s much cheaper.

SEE ALSO: Best Laptops and PCs Round-up

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Samsung 850 Evo – Design

Samsung’s 3D V-NAND marks a sea-change in SSD construction. Previous drives have crammed ever-smaller transistors into horizontal layers in an effort to improve capacities, but now Samsung has stacked its transistors vertically, too.

That means Samsung can fit the same number of transistors into its drives without the pressure to make them smaller – a move that means a huge reduction into the electricity leaks and performance inefficiencies that arrived when tiny transistors were squeezed into traditional horizontal designs. It also means that this drive uses a 40nm manufacturing process – much larger than the 20nm or less used on other SSDs, and an illustration about the lack of pressure now being put on transistor size.

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The 850 Evo has a lower price because it’s built with TLC rather than MLC memory chips. They’re triple-cell rather than multi-cell bits of silicon, which means that each individual data cell stores three bits of data rather than two.

That choice means more data can be stored in the same amount of memory, which means that the Evo’s costs are lowered – but it also means performance will take a hit because of that increased density.

The 850 Evo’s smaller capacities – 120GB, 250GB and 500GB – are powered by Samsung’s MGX controller. It’s a newer chip than the MEX used inside the 1TB 850 Evo and all of the 850 Pro drives, and it’s got two cores rather than three. That sounds like a regressive design, but Samsung argues otherwise: it says the dual-core, ARM-powered chip is more power-efficient, and that its smaller SSDs don’t need the third core anyway.

Some of Samsung’s Evo models differ from the flagship Pro in other departments. The smaller 120GB and 250GB drives have an endurance rating of 75TB, while the 500GB and 1TB versions are rated for 150TB. The former rating is middling, and it’s unable to match the 150TB rating given to all 850 Pro drives.

On the software side the 850 Evo matches its more expensive stablemate. It’s got support for 256-bit AES encryption, TCG Opal 2.0 and IEEE-1667, and it comes with Rapid Mode 2.0, which siloes a portion of a PC’s memory to use as a cache for the SSD’s frequently-accessed files – a mode that can give performance a boost.

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Samsung 850 Evo – Performance

The Evo was never going to match Samsung’s Pro drive for pace, but we’re pleased our 250GB sample wasn’t far behind the 512GB Pro in most tests.

In AS SSD’s sequential read and write benchmarks the Evo scored 510MB/s and 499MB/s. The former figure is 17MB/s behind the 850 Pro, while the latter is only 3MB/s behind. The 850 Evo is a better bet than the Crucial MX100, too: our favourite affordable drive was a little quicker in the read test, but it could only manage 331MB/s when writing.

The 850 Evo impressed in AS SSD’s small file tests. In the 4K read benchmark its pace of 43MB/s actually beat the 850 Pro, and when writing its 96MB/s result wasn’t far behind Samsung’s more expensive product.

The Evo continued its good form in the 4K-64 test, where it wasn’t far behind the Pro drive and still proved faster than most competitors.

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Atto’s benchmarks measure performance across a wide range of file sizes, and here the Evo’s TLC memory proved inconsistent. The Evo was at its best when handling small files: its 419MB/s 8K read and 383MB/s 8K write results smash the Crucial MX100, and it maintained its lead over the cheaper drive when reading files up to 64KB in size – and in every file writing test.

The Evo fell behind in Atto’s larger file read tests, where it topped out at 550MB/s. That’s behind the 850 Pro and the cheaper Crucial drive.

The IOMeter benchmark evaluates an SSD’s longer-term performance, and the mid-range Evo fell between its two rivals in our tests. Its all-in-one result of 5,270 I/Os is good: unable to match the 7,826 I/Os scored by the pricier Pro, but miles ahead of the 2,426 I/Os scored by the MX100.

The Evo sat between its competitors in other IOMeter tests. Its 202MB/s pace was virtually in between the 300MB/s and 93MB/s results returned by the Pro and MX100 drives, and the Evo’s average response time of 0.18ms was faster than the Crucial but a tad slower than the other Samsung.

Other things to consider

The 850 Evo comes with a five-year warranty. That’s two years better than the deal provided with the last generation’s 850 Evo drive, but it’s half the length of the generous coverage that comes with the Pro drive.

The two Samsung drives don’t differ when it comes to their boxed extras – neither have any. That’s a tad disappointing, as SSDs used to come with caddies, blankers and even external enclosures, but it’s becoming more commonplace as costs are cut.

We’ve reviewed the 250GB version of the Evo, which costs £110 – a tempting 44p-per-gigabyte. That makes it better value than the 256GB 850 Pro, which now sits at £136, or 53p-per-gigabyte. It still can’t compete with the Crucial – its 256GB version costs just £78.

The 850 Evo is available in three different capacities, too. The smaller 120GB model costs a slim £72, but you’ll have to pay £198 for the 500GB model. The largest offers a whopping 1TB of space but it’ll set you back £360.

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Should I Buy the Samsung 850 Evo?

The 850 Evo strikes a good balance between price and performance. The inclusion of TLC memory helps reduce the cost, and it’s tempered by 3D V-NAND, which helps keep performance ahead of budget drives and within touching distance of the Samsung flagship.

The good pace and £110 price mean the 850 Evo is the best mid-range SSD we’ve seen, but the shrinking prices and increasing capacities of this market mean the margins between competing products are smaller than ever. The MX100 is a good budget alternative for modest machines, and the 850 Pro delivers better performance for a little extra cash.

SEE ALSO: Best SSDs Round-up


The 850 Evo mixes cheaper memory with 3D V-NAND technology to strike a keen balance between price and performance, and it makes for an SSD that’s one of the best mid-range drives we’ve ever seen. The faster 850 Pro isn’t much more expensive, though, and capable budget SSDs are available for even less cash.

Overall Score



January 14, 2015, 2:30 pm

When the heck are sammy-boy gonna bring out deh 3tb 2.5 ssd? It'll be an arm and a leg to be sure to be sure, but seeing that I'm an octopus with lizard genetics, that shouldn't be a problem ahehehe...

M⃠ ⃠S⃠ ⃠i⃠ ⃠N⃠ ⃠L⃠u⃠n⃠d⃠

January 17, 2015, 10:34 am

Extras = crap most people wont use = more garbage poured into the environment.

Who the F needs a chunk of metal packed in the box, that weight more that the drive itself, when the drive is so light it can be mounted using pretty much anything you have laying around?


March 29, 2015, 1:10 pm

"The Evo was at its best when handling small files: its 419MB/s 8K read and 383MB/s 8K write results smash the Crucial MX100"
I personally got 408MB read 443MB write results. Big difference??


November 2, 2015, 1:31 pm

I'm not sure "The more expensive one is faster" is really a valid point against...

Nor is "cheaper than the more expensive one" a particularly valid point in favour.


March 3, 2016, 3:19 pm

This is the exact product that you must purchase if you are truly into experiencing the fastness of the ever changing world. If you have had a hard time with the traditional disk drives, Samsung SSD 850 Evo series is the best budget-performance-oriented solution available.

Thanks to the high reliability and the excellent build quality, EVO 850 is a product which you cannot easily hate. With the wide variety of capacities available from EVO series, I have bought the 120 GB version and it has given me every little point to be satisfied with the money I spent. Also, my simple requirement of needing an SSD to install the OS, helped my cause of loving the Evo 850.

What's not to forget is that, there are many sellers and some do sell fake products. It's important to buy from genuine sellers and I have found that Gear Best offers a decent service. Check the link given below, where you can buy Evo 850 120GB for a great price! Sometimes there are flash sales as well, so the luck might be in your favour.



May 29, 2016, 12:12 pm

I just installed the 250 GB model in a 7 year old Toshiba notebook. I obviously need a new one but this drive will extend this notebook's life until I can put away some cash for the one that I want. It's probably the best upgrade that you can do for an old computer.

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