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Results: 128 KB Sequential Reads

Samsung 840 EVO SSD: Tested At 120, 250, 500, And 1000 GB
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Fantastic sequential read and write performance is a trademark of modern SSDs. To measure it, we use incompressible data over a 16 GB LBA space, then test at queue depths from one to 16. We're reporting these numbers in binary (where 1 KB equals 1024) instead of decimal numbers (where 1 KB is 1000 bytes). When necessary, we're also limiting the scale of the chart to enhance readability.

128 KB Sequential Read

The y-axis starts at 300 MB/s because we need all of the separation we can get to distinguish the larger three 840 EVO drives. Samsung's 120 GB model has a funkier trajectory, starting under 400 MB/s, peaking at a queue depth of two, above the higher-capacity models, and then stumbling again at a queue depth of 16. Such is life for a drive with just eight dice to call its own.

Folding in the rest of the field, only Intel's SSD 335 working with incompressible data at low queue depths stands out. 

With a single outstanding command, 100 MB/s separates the fastest and slowest SSDs. Samsung's 840 EVOs are in the thick of it.

Are you wondering which of the drives we tested fares best in our 128 KB sequential read test? Here's a break-down of the maximum observed read performance during Iometer-based benchmarking.

All four 840 EVO drives set up shop in the middle of the pack, though almost every sample lands roughly in the same ballpark. They all push past 500 MB/s at least.

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  • 1 Hide
    Someone Somewhere , July 25, 2013 5:37 AM
    Surely it would make sense to compare it to the vanilla SSD840. Also, there's no 840 Pro in the power charts.

    While the 1TB drive coming down to ~65c/GB is nice, seeing the 120 GB drives get near there would be nice. Especially since this is meant to be the value king.
  • -2 Hide
    drwho1 , July 25, 2013 6:45 AM
    I have 2 840 pro 512 GB SSD's (1 on my notebook 1 on my PC)

    I got them on a sale on Newegg for around $500 for both of them. :) 

    A 1TB would be cool if I find it on sale....
    or maybe I should try out writing a letter to someone fat in some weird red costume...
  • 5 Hide
    slomo4sho , July 25, 2013 7:45 AM
    The performance gap between the 840 Evo and 840 Pro is discouraging for the lower capacity models. I understand that the Pro is the flagship product but I was expecting less of a gap in in the 120GB models since this is a newer generation product and the 840 Pro is still based on the 21nm MLC NAND. However, the 1TB model is is a great choice for mass SSD storage. Lets hope the prices drop below $0.50 per GB soon.
  • 1 Hide
    Someone Somewhere , July 25, 2013 7:48 AM
    MLC is faster than TLC, and bigger node NAND is usually faster. Only reason to go smaller is price and power.
  • 0 Hide
    SteelCity1981 , July 25, 2013 8:20 AM
    I wonder if samsung plans on releasing a pro evo series since the regular series evo is to replace the older non pro versions.
  • -2 Hide
    razor512 , July 25, 2013 8:40 AM
    ripoff, high prices for triple level flash especially at 19mm, the lifespan will likely suck and their shortened warranty represents that.
  • 0 Hide
    master9716 , July 25, 2013 8:41 AM
    Cost for performance = Very High . ofcourse its not going to perform like a Pro but for the cost im amazed its that much better than the Regular 840.
  • 2 Hide
    expl0itfinder , July 25, 2013 10:00 AM
    Samsung makes some good looking drives. I'm loving the matte grey.
  • 0 Hide
    J_E_D_70 , July 25, 2013 10:09 AM
    Glad this review also refutes the perception of low TLC write endurance in normal desktop workloads. Been using a 128GB 840 in a daily-use desktop for eight months now and the endurance counter hasn't decremented at all. I'll have replaced the entire rig long before it wears out.
  • 4 Hide
    JohnnyLucky , July 25, 2013 10:38 AM
    Interesting review. I think the point to remember is that the 840 EVO is not a high end enthusiast ssd like the 840 Pro. Instead, consider the 840 EVO as a mainstream ssd suitable for most consumer and home office scenarios.
  • -2 Hide
    JohnnyLucky , July 25, 2013 10:38 AM
    Interesting review. I think the point to remember is that the 840 EVO is not a high end enthusiast ssd like the 840 Pro. Instead, consider the 840 EVO as a mainstream ssd suitable for most consumer and home office scenarios.
  • 1 Hide
    joshua305 , July 25, 2013 10:51 AM
    Very interesting article. I would love to see it compared to m-500 in the charts as that seems to be the really direct competition. Is the caching feature in magician windows only? No OSX or Linux?
  • 0 Hide
    joshua305 , July 25, 2013 10:52 AM
    Very interesting article. I would love to see it compared to m-500 in the charts as that seems to be the really direct competition. Is the caching feature in magician windows only? No OSX or Linux?
  • 0 Hide
    ssdpro , July 25, 2013 11:01 AM
    The question is, does it suffer from the sudden bricking some SSD (including the 840 Pro) experience? And is RAPID the first fruit from the Nvelo acquisition? If so that is a data-loss bonanza. I hope Tom's can check into that further as promised.
  • 0 Hide
    Azn Cracker , July 25, 2013 11:04 AM
    hmm was going to buy a regular 840 because it was on sale for $90. Think ill just hold off for the EVO
  • 0 Hide
    marraco , July 25, 2013 12:09 PM
    Nice, but I still run an X58 system, with slower SATA, so I can't take advantage of this.

    Samsung: I need this drive with 2 SATA connectors so it makes possible to create a virtual RAID, and squeeze the drive performance.

    Is clear that newer drivers are bottlenecked by the fastest SATA, so out of PCIE drives, virtual RAIDS are necessary.
  • 1 Hide
    MC_K7 , July 25, 2013 12:31 PM
    I really like that the new Evo 120GB is able to achieve 410 MB/s of write speed! That's such a big jump from the disappointing 130 MB/s of the previous 840 it replaces. When you think about it that was pretty much the same write speed as a mechanical drive lol.
  • 0 Hide
    MC_K7 , July 25, 2013 12:32 PM
    I really like that the new Evo 120GB is able to achieve 410 MB/s of write speed! That's such a big jump from the disappointing 130 MB/s of the previous 840 it replaces. When you think about it that was pretty much the same write speed as a mechanical drive lol.
  • 2 Hide
    MC_K7 , July 25, 2013 12:34 PM
    Sorry for the double-post guys the website is acting funny. I got "an error occurred" after trying to post the first comment, but it looks like it went through anyways.
  • 2 Hide
    cryan , July 25, 2013 12:52 PM
    You don't get the 120 GB's 410 MB/s all the time, but you should get a substantial increase in day to day activity. If you look at the Robocopy results, you'll see that if you try copying 16.2 GB worth of stuff it's not much faster. On the other hand, if you're just copying a few GB from one drive to another, the EVO 120 GB can be almost as fast -- almost -- as the 840 Pro.

    Regards,
    C. Ryan

    Quote:
    I really like that the new Evo 120GB is able to achieve 410 MB/s of write speed! That's such a big jump from the disappointing 130 MB/s of the previous 840 it replaces. When you think about it that was pretty much the same write speed as a mechanical drive lol.


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