250Gb ssd samsung 850 evo

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Samsung 850 Evo 250GB MZ-75E250B

The number of benchmark samples for this model as a percentage of all 12,454,608 SSDs tested.

850 Evo 250GBSamsung  $90Bench 104%, 391,458 samples3,017x
EDIT WITH CUSTOM PC BUILDER Value: 100% - Outstanding Total price: $996
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Samsung 850 Evo 250GB Review

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

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.

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.

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.

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.


Samsung 850 EVO 250GB 3D V-NAND SSD Review

Earlier this morning, we tested and discussed Samsung's new 850 EVO 1TB SSD that uses 3-bit 3D V-NAND technology. The 1TB model is the only new EVO product to carry over Samsung's MEX controller from the 840 EVO and 850 Pro products. The 120GB, 250GB, and 500GB 850 EVO drives sport a new ARM-based controller we haven't yet seen.

New flash is paired with the new controller. The 850 EVO uses the same 3D V-NAND technology that first appeared in the 850 Pro, at least on the consumer SSD side. You can find a detailed overview of Samsung's 32-layer vertically stacked NAND in this article. What makes the 850 EVO's V-NAND different from the 850 Pro's V-NAND is the number of bits held in each cell. The 850 EVO stores three bits per cell, one more bit than the 850 Pro's two bits per cell. Of course, what we are talking about is the difference between multi-level cell (MLC), and triple-level cell (TLC) technology.

The Samsung 850 EVO ships in four capacities, 120GB, 250GB, 500GB, and a large 1TB model. In this review, we will mainly focus on the 250GB, but we will also discuss the 120GB model in some places. The 120GB and 250GB 850 EVO products are very similar, much like the 500GB and 1TB models are similar.

Samsung's product specifications show us that the 250GB 850 EVO is capable of delivering up to 540 MB/s sequential read and 520 MB/s sequential write speeds. 4K random read performance is quoted at 97K IOPS, and 4K random write performance is up to 88K IOPS. Samsung is one of the few SSD makers unafraid of publishing random read QD1 performance data. With over 10K random read IOPS at QD1, we are not surprised since this is the tipping point that separates good SSDs from great SSDs.

Samsung's TurboWrite technology adds a SLC buffer layer to the flash. This takes place in the flash translation layer, which is a map of where data is stored on the SSD. The FTL can allocate data, telling a TLC cell to hold only 1-bit instead of three to increase the write transaction speed. Writing 1-bit is faster than writing three. The performance difference comes into play once all of the designated SLC-like area is full. At that point, the data needs to write to the drive in TLC mode, which is slower than SLC mode. The 850 EVO 250GB model writes sequential data at 520 MB/s in SLC mode, and 300 MB/s in TLC mode.

The random write performance also changes slightly in and out of TurboWrite. Inside the buffer zone, the 850 EVO 250GB writes 4K random data at 88K IOPS. Once the buffer is full, and the drive is forced to write to the TLC area of the flash, the performance drops to 70K IOPS.

The Samsung media guide for the 850 EVO shows us that Samsung is in line with our testing and evaluative thoughts on what makes a good consumer SSD. Samsung isn't afraid to publish low queue depth random performance, even though the market still likes to highlight high queue depth performance. The new MGX controller found on the 120GB, 250GB, and 500GB models was designed to deliver performance where most mainstream users need it, sequential and low queue depth random workloads.

All 850 EVO capacities support AES 256-bit full disk encryption, and work with eDrive, Waves, and other SED software suites. The 850 EVO also supports DEVSLP, a technology that lowers power consumption when the drive is idle, and increases notebook battery life. RAPID Mode also gets an update, and Samsung tells us to look for a near 2x performance increase in Windows start up, and application loading. Magician will update to version 4.5. You can see an overview of Magician 4.4 here. Samsung also includes Data Migration software that allows users to clone an existing drive to a Samsung SSD easily and quickly.

The 850 EVO 500GB and 1TB models match the endurance ratings of the 850 Pro. The 120GB and 250GB models have a TWB rating of 75 (TB of data that can be written to the drive). That comes out to 40GB a day, which is the same as the 840 EVO. Samsung did increase the warranty terms on the 850 EVO model to five years; the 840 EVO shipped with a three-year warranty.

Just prior to launch, Samsung sent over the MSRPs for the 850 EVO. The 250GB model will cost $149.99 at launch, and we don't expect to see a price drop until after Christmas, or possibly until as late as March 2015. A number of mainstream 256GB class SSDs currently sell for $109.99; a few even sell for less. The only SSD on the market at the time of writing that comes close to the 850 EVO's specifications is the Intel 730 Series 240GB, but the 240GB 730 lacks DEVSLP, and has a lower TBW rating. We can't recommend the 730 Series for notebook use since it pulls more power than a mechanical SSD. This leaves the 850 EVO in a class of its own at this price point.

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