Samsung 850 EVO mSATA SSD Review (120GB/1TB) – Another Form Factor Option For A Great-Performing Drive


For our power consumption testing, we have the drive connected to the system as a secondary drive. To record the wattage, we are using an Amprobe AM-270  multimeter connected in line with the 5v power on our SATA power cable to the drive. The multimeter records the min/max amperage draw from the drive over our testing period.

We also record the drive’s sequential and random read and write power draw using Iometer. During power testing we have AHCI link power management (HIPM and DIPM) enabled. We then take the values recorded and calculate the wattage of the drive. Some of the results may seem high compared to a standard notebook HDD as these are peak values under load. When we see average power draw, SSDs are still more power efficient because they only hit max power for a short period of time.

Samsung 850 EVO mSATA Power Consumption

Not surprisingly, the 1TB mSATA 850 EVO draws a bit more power in all aspects of the testing than the 120GB version.  At startup, the 1TB peaks briefly at 5.61w, while the 120GB peaks briefly at just over 2w.  At idle, the 1TB was drawing .09w to the 120GB’s .06w.  Sequential reads saw the 1TB drawing up to 5.25w, with the 120GB drawing up to 3.15w.  Sequential writes indicated the 1TB drawing up to 4.59w, and the 120GB drawing up to 3.11w.  4K reads drew 2.63w with the 1TB, and 1.58w with the 120GB.  4K writes drew 4.20w with the 1TB, and 2.78w with the 120GB.  And finally, the maximum measured power draw was 6.11w for the 1TB version, and 3.17w for the 120GB version.  While the mSATA 850 EVO product page specifications only indicate average and maximum power draw (burst mode), our results fall within the stated ranges.


Samsung has certainly figured out how to create great-performing drives, and also is making them some of the most affordable in any price-to-performance analysis.  Their new 3D V-NAND technology is allowing them to increase drive capacities in all form factors, now even creating large-capacity SSDs on the smallest of PCBs.  Who would have thought that we would see 1TB of flash storage capacity on an mSATA SSD that measures only 1.18″ x 2″ x 0.15″?  This bodes well for the future of mobile computing and products such as laptops and notebooks, as we should begin seeing large storage capacity versions at much more affordable price points.

Samsung 850 evo mSATA final image

Looking at the cost-per-gigabyte of the mSATA 850 EVO SSDs, the 120GB version’s MSRP of $79.99 puts it at $0.66/GB, with the 250GB ($129.99) at $0.52/GB, the 500GB ($229.99) at $0.46/GB, and the 1TB ($449.99) version at $0.45/GB.  Also bear in mind that SSD prices tend to trend downward a bit once channel availability becomes a little more widespread.

Since nearly all manufacturers utilize ATTO as their benchmark of choice for establishing their manufacturers’ performance specifications, we were not the least bit surprised that our mSATA 850 EVO review samples bested those specs by a few percentage points.  What we were surprised at was that these drives were able to hit 500MB/s reads (and correspondingly fast writes) at some point in virtually every benchmark we threw at them — even with AS SSD and Anvil, which are more rigorous than the other benchmarks.  Even with Crystal Disk Mark set on “random” rather than “zero fill” (incompressible versus compressible data), reads and writes were right at the published sequential performance specs of 540MB/s reads and 520MB/s writes.

We were also pleased to see the consistency exhibited by the mSATA 850 EVO SSDs.  A good measure of an SSD’s consistency is the difference between read speeds and write speeds, not just with ATTO, but with other benchmarks also.  The difference between read and write speeds of the mSATA 850 EVO SSDs was a comparatively narrow gap with virtually all of our tests, putting it above the majority of other consumer SSDs available today.  When we add Samsung’s five-year warranty into the mix, and a free download of Samsung’s Magician software (their version of an SSD toolbox), the mSATA 850 EVO SSDs become an excellent value for a top-performing SSD.  We are proud to award the Samsung mSATA 850 EVO SSDs our gold seal.


Check out the Samsung 850 EVO M.2 SSDs on Amazon Today!

Review Overview

Build and components
SSD performance
Price and availability

540MB/s reads, 520MB/s writes, 97,000 IOPS!

Another pair of top-performing SSDs from Samsung! As good as any equivalent-capacity consumer-grade SATA 6Gb/s SSDs out there!

User Rating: 1.87 ( 9 votes)


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    It would appear, thus far that the Kingston HyperX Predator M.2 SSD. Is that a safe assumption?

    Of course I’m only asking this because I purchased the Predator secondary to your stellar review last week!

    • blank

      Hi, Thanks for the comment!

      Unfortunately, I’m not quite sure what your question is. You mentioned the HyperX Predator, so I’m assuming you’re comparing that to the drive in this report.

      While both drives are very good and have their uses, they can’t be compared 1-1 as the Samsung 850 drive in this report is is an MSATA, which is meant primarily for use in mobile devices such a ultrabooks and tablets, etc. The Kingston drive is an M.2 PCIe SSD which is meant for use in desktop environments where either a full on PCI Express 3.0 or M.2 slot is available.

      Both drives are also priced differently as well, which further places them at different sections of the market.

      Again, we appreciate your feedback and hope we were able to answer your questions and provide helpful information.

      • blank

        Thanks for the reply Donny. With the recent release of the Intel PCIe ssd, I’m just wondering whether I should have waited to buy the Kingston HyperX Predator!

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    With a Samsung EVO 850 500Gb mSATA SSD, I tested “Rapid Mode” from Samsung Magician v4.9 on a HP Z15 laptop (i7-4700MQ 3.2 Ghz – Windows 7 x64). Using ATTO v3.05 to benchmark. I had a solid 548mb read / 420 Mb write starting at 32kb all the way to 64Mb whereas with rapid mode on, it peaked at 562Mb read / 478 write at 1Mb file size then went down from there – by 64Mb was 373 read / 304 write! Of course to fully understand the stats, you need to see the results bar graphs but wow…rapid nerf performance is really what “rapid mode” does! And as another article on this site about rapid mode proves that Windows already does a good job at caching and I am good with that!

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    Please HELP with this question:
    I have a samsung ativ book 9 (ultrabook) that has an internal 128GB ssd that is also a msata. I also have the samsung EXTERNAL 500GB msata ssd. I was wondering if I can open the external ssd cover and switch the ssd with the one inside my lapotop so I can upgrade the memory from 128 to 500GB. Is this possible? Thanks.

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