Samsung 750 EVO SSD Review

Performance Testing

Comparison Products

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Nearly all of the drives in our comparison charts utilize TLC NAND with write enhancement mechanisms to deliver high burst speeds that are not sustainable for more than a few seconds.

Samsung's SSD 850 EVO is the current mid-range performance leader. Its quad-plane TLC flash breaks the mold and delivers longer sustained write speeds than other TLC-based drives with flash from Toshiba and Micron. The Plextor M6V is a newer model that uses the same approach as the Reactor. It comes equipped with the same SMI SM2246EN controller, but pairs it with Toshiba's 15nm MLC NAND.

To read about our storage tests in-depth, please check out How We Test HDDs And SSDs. Four-corner testing is covered on page six of our How We Test guide.

Sequential Read Performance

Even with eight levels of charge to sort through, nearly every drive hits the SATA interface's maximum performance level. As always, queue depth is important to consider, and we see more performance variation at the low queue depths encountered on a daily basis.

Samsung's 750 EVO 250GB outperforms the 850 EVO, though the results indicate only a slight difference between both products. The 120GB 750 EVO does give up some sequential read speed at low queue depths compared to the other Samsung drives, but that's to be expected since it's working with half as many flash dies.

Sequential Write Performance

Samsung's TurboWrite algorithm performs well in our tests, even though we don't leave a lot of time for the buffer to flush between runs. Many competing products show up as waves, since they struggle to flush the emulated SLC buffer data to much slower TLC.

The third image illustrates the large block size sequential roll-off and sustained sequential write performance. Samsung's 750 EVO maintains writes in excess of 200 MB/s. Until recently, Samsung was the only vendor to hit that level using TLC NAND. Phison has caught up, though, with its direct-to-die write algorithm. We simply don't have a low-capacity Phison S10-based drive to add to our charts.

The 120GB SSD 750 EVO reaches the same performance in the buffer stage, but writes quickly drop to 140 MB/s after an extended load. TLC's native write speed won't become an issue until you need to send a lot of data to the drive at one time. Installing software and transferring large photo albums are two common examples of when you'd do that.

Random Read

The emulated SLC buffer works to keep random performance high. Even though the SSD 750 EVO should be a very low-cost drive, it still delivers admirable random read results, which is important because most of your data transactions take the form of small-block reads and writes. The trade-off is a hit to endurance, which becomes an issue later in the product's life.

Random Write

The 750 EVO and 850 EVO are separated by write performance. When we test with small blocks of data written randomly, the gap between them grows more than we saw in our sequential tests. Even at low queue depths, the two drives seem pretty similar to each other at any given capacity point. But as the queue depth increases, so does the 850 EVO's edge. Then again, the 250GB 750 EVO responds to our random write workload more favorably than the non-Samsung SSDs we benchmarked.

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  • dangus
    got the endurance wrong on the spec charts
    2
  • SteelCity1981
    wow the battery life benchmarks on the 750 EVO is highly impressive, it make the 850 EVO's look power hungry. i wasn't expecting to see that at all esp from a non 3D V-NAND SSD. So if getting the most out of your battery life in your portable pc device is very important to you, then def the 750 EVO is the way to go.
    2
  • JUSTPLAY
    correct endurances.120gb has 35tbw and 250gb has 70tbw
    1
  • araczynski
    Of course they're intending these for system integrators, who get a marketing bullet point at a reduced price, and while their lifespan is inferior, the eventual failures will fall out of the integrator's default warranty period ("not our problem, buy a new one from us"). Personally I think this is a cheap move to milk consumers. Samsung should stick to the middle/high level stuff while they still have a good reputation at quality.
    1
  • Gam3r01
    Quote:
    Of course they're intending these for system integrators, who get a marketing bullet point at a reduced price, and while their lifespan is inferior, the eventual failures will fall out of the integrator's default warranty period ("not our problem, buy a new one from us"). Personally I think this is a cheap move to milk consumers. Samsung should stick to the middle/high level stuff while they still have a good reputation at quality.


    While I do enjoy recommending Samsung's high end drives, I dont see this as milking customers. I would be more comfortable seeing a 750 evo inside a low budget system than kingston's SSD Now! drives. They saw a market in low cost, cheaper made drives. I am happy to see Samsung moving their old tech into this area. Its not the fastest, nor the highest quality drive, but it fits.
    I dont see Samsung's quality reputation getting hurt any time soon.
    2
  • phoenix32x
    I am confused. How is this good/better or useful? The 250GB 850 EVO is quite often available for $80. $5 less for inferior flash with less endurance. I don't get the point I guess.
    5
  • Gam3r01
    Anonymous said:
    I am confused. How is this good/better or useful? The 250GB 850 EVO is quite often available for $80. $5 less for inferior flash with less endurance. I don't get the point I guess.


    I see the price dropping once it becomes available. Otherwise I agree it wont have a place at that price.
    2
  • darkbreeze
    At twenty bucks less it makes sense, otherwise, it would be worth the extra twenty bucks simply for the longevity. Especially when the Sandisk Ultra II has similar performance to the 850 EVO in most capacities for a lower price.
    0
  • joex444
    Quote:
    wow the battery life benchmarks on the 750 EVO is highly impressive, it make the 850 EVO's look power hungry. i wasn't expecting to see that at all esp from a non 3D V-NAND SSD. So if getting the most out of your battery life in your portable pc device is very important to you, then def the 750 EVO is the way to go.


    You're absolutely not wrong that the 750 seems to give about an hour more battery life than the 850 does, but let's remind ourselves that these plots were made starting at 500 minutes not 0 minutes. That's inherently deceptive, and obviously THG would say it's meant to show the variation more clearly, but the fact is that the bar looks like it's 70% longer (170 apparent units versus 105 apparent units), we should divide the values to reveal the true benefit: 10.7%. I may not be that inclined to get up in a tizzy about an extra 10% or an extra hour -- particularly when the 850 already allows 10 hours of usage -- but an extra 70% would be truly outstanding. Alas, that 70% is merely deceptive non-zero starting points on a graph.
    2
  • Math Geek
    endurance is not that bad really unless you try to use it as a torrent drive or something silly like that. during the 3 yr warranty period for the 120 gb drive, you'd have to write 32 GB per day to the drive to reach the 35 TB TBW. sure the initial windows install and program installations will take up a bit of this but once that is done, day to day use won't get anywhere near this number for the average user.

    double this amount for the 250 GB drive since it has the same 3 yr warranty but a 70 TBW and you're even further than breaking this threshold. even storing data on it won't do much since this is usually written once and then read over and over. the reading of the data does not go against this TBW rating.
    2
  • popatim
    tHE 850 EVO BEING $3 MORE, WHATS THE POINT OF THE 750?
    i SEE A LARGE PRICE DROP IN IT'S FUTURE.
    0
  • Justiful
    System builders are not this drives target demographic. Nor is the target people who shop online. It is meant for pre-built computer companies that use the cheapest versions of power supplies, motherboards, stock GPU's, and low cost fans.

    Honestly cyberpower, ibuypower, dell, ext. As we all know on these forums even picking high quality versions of the same parts, and hiring a tech for $100 to assemble it is still cheaper then buying a prebuilt from these people.

    I stopped getting prebuilts because the motherboards, ram, storage, PSU's, and fans are all bottom shelf. Even if you can find one that is "close" in price to building yourself it never compares in quality. Plus whats the deal with the "upgrade" to name brand parts costing the same or more than the part sells for on amazon or newegg. Oh and anyone who ever spent $20 less on windows for OEM since windows 7... you could have had copies of windows 10 for life had you just spent the extra money the first time. OEM license is tied to a single motherboard, boxed version is good forever 1 PC at a time.
    2
  • hurnii
    "Over time though, a problem emerged. Customers found that older data on the drives would read back much slower than fresh data. Samsung fired back with a pair of firmware upgrades and we haven't heard much of the issue since then. "

    Actually, we heard quite a bit more about the 840 EVO's slow read speed after data has been sitting for a month or two issue than this whitewash paragraph would suggest. In addition to the two firmware updates (which did NOT correct the issue), Samsung released a tool which would refresh ( read from and write back to) every block of data on the drive.

    The slowness of reading was due to the stored charge leaking out more than expected, leaving a lower than expected read voltage, meaning error correction was performed (re-reading the cell multiple times) which slowed down the read.

    As long as the data is refreshed (read and re-written) every several weeks, the 840 EVO drive read speed doesn't get too slow. This has a direct effect on the usable endurance of the drive. Multiple tech sites had threads that were active for several months (some over a year) concerning this issue.

    Presumably, 3d V-NAND based TLC is not prone to this issue (larger geometry = less leakage), but planar TLC is. Hopefully, the LDPC can correct for the drift without slowing down too much. Might be a good idea to wait a few months, make sure no one runs into another "old data reads slowly" situation, before buying.
    1
  • Solandri
    Quote:
    As long as the data is refreshed (read and re-written) every several weeks, the 840 EVO drive read speed doesn't get too slow. This has a direct effect on the usable endurance of the drive.

    While I don't disagree about the seriousness of the problem, the fix has no practical impact on the usable endurance of the drive. The 250GB 840 EVO lasted 900 TB of writes in the long-term endurance test. Even if the drive were completely full and you refreshed the data every 2 weeks to avoid this problem, it would take you 138 years for the refreshes to reach 900 TB of writes.

    Or put another way, if the expected lifetime of the drive is 20 years (you are averaging 865 GB of writes to the drive per week) and 65% of the drive contains "old" data which needs to be refreshed, refreshing it once a month will reduce the expected lifetime of the drive to (900 / (.865 + .250*.65/4)) / 52 = 19.1 years. Frankly, if you find yourself still using a 840 EVO after 19 years, you have more serious issues to worry about than the 840 EVO problem.

    http://techreport.com/review/26523/the-ssd-endurance-experiment-casualties-on-the-way-to-a-petabyte/2
    2
  • rhysiam
    Quote:
    Of course they're intending these for system integrators, who get a marketing bullet point at a reduced price, and while their lifespan is inferior, the eventual failures will fall out of the integrator's default warranty period ("not our problem, buy a new one from us"). Personally I think this is a cheap move to milk consumers. Samsung should stick to the middle/high level stuff while they still have a good reputation at quality.

    There's clearly a market for cheaper planar TLC drives, why shouldn't Samsung compete there too? Write issues on SSDs are so massively overblown. How many people buying SSDs are going to write 20+GB of data to their SSD every day of the year for 3-4 years? That's the kind of writes required reach the wear levels. Rating on wear levels are usually extremely conservative too (perhaps even purposefully to push consumers with bigger wallets towards more expensive products with higher margins). So even after 4 years of 20GB written per day, you're pretty likely to get another few years out of the drive anyway before you start to hit issues. The vast majority of computer users would get likely 10 get years out of the drive before they approached the wear levels. I'm glad these SSDs exist. It'll push competition.
    0
  • rhysiam
    Quote:
    While I don't disagree about the seriousness of the problem, the fix has no practical impact on the usable endurance of the drive. The 250GB 840 EVO lasted 900 TB of writes in the long-term endurance test. Even if the drive were completely full and you refreshed the data every 2 weeks to avoid this problem, it would take you 138 years for the refreshes to reach 900 TB of writes.

    My bigger issue with the whole mess was the amount of time it took Samsung to properly address. Reports starting emerging in August 2014, Sammy took until October to release the first "fix" - which was only a temporary workaround. It wasn't until April the following year that the second fix properly addressed the issue (it automated the periodic re-writing of older data).
    Plus, the original 840 (non EVO) was also affected but I'm not sure if a fix for this drive was ever actually released.
    0
  • zodiacfml
    Decent performance. I thought this was Samsung's poor way of replacing the 850 EVOs in these two capacities. They won't be able to serve these two capacities with the new 48-Layer V-NAND.

    Don't judge yet with current pricing as I think they want to get rid of all 850 EVOs to be replaced by the new 750s.

    Since the PCBs are becoming smaller for each generation, can't they make the 2.5" chassis smaller without breaking compatibility for even more reduced costs.
    0
  • Gam3r01
    Anonymous said:
    Decent performance. I thought this was Samsung's poor way of replacing the 850 EVOs in these two capacities. They won't be able to serve these two capacities with the new 48-Layer V-NAND.

    Don't judge yet with current pricing as I think they want to get rid of all 850 EVOs to be replaced by the new 750s.

    Since the PCBs are becoming smaller for each generation, can't they make the 2.5" chassis smaller without breaking compatibility for even more reduced costs.


    Why would these 2D models replace the 3d VNAND on the 850 EVOs?
    Or do you mean 840.
    0
  • zodiacfml
    10% more is still impressive since the real world performance is the same as the 850 even though we don't need that value.

    Quote:
    Quote:
    wow the battery life benchmarks on the 750 EVO is highly impressive, it make the 850 EVO's look power hungry. i wasn't expecting to see that at all esp from a non 3D V-NAND SSD. So if getting the most out of your battery life in your portable pc device is very important to you, then def the 750 EVO is the way to go.


    You're absolutely not wrong that the 750 seems to give about an hour more battery life than the 850 does, but let's remind ourselves that these plots were made starting at 500 minutes not 0 minutes. That's inherently deceptive, and obviously THG would say it's meant to show the variation more clearly, but the fact is that the bar looks like it's 70% longer (170 apparent units versus 105 apparent units), we should divide the values to reveal the true benefit: 10.7%. I may not be that inclined to get up in a tizzy about an extra 10% or an extra hour -- particularly when the 850 already allows 10 hours of usage -- but an extra 70% would be truly outstanding. Alas, that 70% is merely deceptive non-zero starting points on a graph.
    0
  • catilley1092
    If the Samsung 750 EVO SSD is superior to the 850, then why the shortened warranty? It's the same 3 year one that the Samsung 840 EVO line had, and needs to be added to the equation.

    For example, why would I want to replace my 850 EVO with a 5 year warranty for one with a lesser one? Something there just doesn't sound right, plus for ponying up a few more dollars (maybe $25 for the 256GB version), one gets a 10 year warranty with the Samsung 850 Pro, which I also have a 500GB version of.

    What Samsung doesn't want to do is water their brand down by distributing a SSD to compete with sub $50 models at the 120GB level. Used to be, most everything Samsung touched became liquid gold, until they decided to release Windows notebooks with shabby firmware & tried to compete directly with Apple with some of these offerings.

    And why they're no longer a distributor of Windows notebooks. Samsung doesn't want to do the same with their SSD's, rather improve the models still on the market, maybe also ship with some Opal encryption software to sweeten the deal.

    Cheaper doesn't equate better, is the bottom line.

    Cat
    -2