Samsung 840 EVO 120GB low random read (IOPS)

I am attaching samsung magician benchmark. My random read is quite low. I though it to be somewhere in the region of 94000(I checked other sites). But mine is only around 54000. It is connected to sata3 port and in AHCI mode as you can see in the image. What is the reason for this low random read and what is the solution?

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  1. Did you try other benchmarks?

    What motherboard do you have, and what SATA3 port is the SSD connected to? SATA3 ports with a third-party controller (often from Asmedia) can seriously hinder performance... though normally that would be most evident in the sequential performance.
  2. Sakkura said:
    Did you try other benchmarks?

    What motherboard do you have, and what SATA3 port is the SSD connected to? SATA3 ports with a third-party controller (often from Asmedia) can seriously hinder performance... though normally that would be most evident in the sequential performance.


    this is my motherboard.

    http://www.gigabyte.us/products/product-page.aspx?pid=3812#sp

    I dont know how I can identify sata3 controller.
  3. All the SATA ports on that motherboard are native, so that's not an issue.
  4. Did you use Magician to set maximum performance?
  5. popatim said:
    Did you use Magician to set maximum performance?


    Nope. It was set to maximum reliability.

    now I am attaching pic of benchmark after setting maximum performance. No improvement.




    also my boot up time seems slow to me. Boot racer gives ~25 seconds. And also I counted manually. After pressing the power button of the CPU, it takes about 70-75 seconds to boot.
  6. I am also having a similar problem. I have the 250gb Samsung 840 not 'Pro' or 'Evo' just the 840. Specs are, 540 read and 250 write, 96000 IOPS read and 62000 IOPS write. I am getting better than 540/250 sequential read/write access, but very poor IOPS performance.

    I was getting terrible (1/4 to 1/2 of spec) IOPS from read and write until I followed a guide to optimize SSD performance. The results are that I am still not hitting at, or near 96000 IOPS-read as advertised by the Magician Software. But I did get a good increase in read IOPS but can't do better than 65k-68000 read still, where as before the optimization routine I was getting half or less of the advertised IOPS for read and write. The write IOPS after optimization shot right up to spec just over or under 62000. But no matter what I try or suggestions I employ, I still can not get my read IOPS near 96000. Here is the page I used and completed all recommended 'fixes'. This was posted in another thread on tomshardware about a similar problem with another Samsung 8xx series SSD. http://www.computing.net/howtos/show/solid-state-drive-ssd-tweaks-for-windows-7/552.html

    After using that guide my SSD is performing a lot better, but still not as it should. on another note; I ran "AS SSD BENCHMARK" software and it reported a max of 78000 IOPS read where as Samsung's Magician software will only report a max of 68000 at best. And last to note, every time I run the benchmark in Magician the readings swing wildly sometimes bad and sometimes good. This low Read/Write IOPS problem is all over the forums recently for the Samsung 8xx series drives. I'm going to try the add on Sata3 controller on my board because I currently have the SSD running on the Intel's Chipset Sata3 controller, but my motherboard has a Marvell Sata3 controller added on with 4 extra sata3 ports. I'll try one of those and see if it makes any difference and post back.

    I hope some guru can figure this out, I've also heard many people calling Samsung, going through all the hoops, and leave the Samsung Tech's scratching their head as well. What's going on Samsung?!

    Please anyone who may know, please give us poor Samsung 8xx series owners a solution so we can enjoy these SSD's at their full potential. I will say though, still beats the heck out of my Hitachi Deskstar 750GB Sata2 drive.

    Lastly, I'm running these benchmarks on a fresh install of Win7 x64 Ultimate SP1. All drivers for Chipset, Motherboard, Soundcard, and Video Cards. That's it, nothing else to bung up the results.

    My System: Just in case
    Windows 7 x64 Ultimate SP1 (automatic update)
    EVGA DARK X79 Socket 2011 Motherboard
    EVGA G3 1300 watt PS
    Intel 4930k Ivy-Bridge 6-Core 3.4ghz @ 4.0ghz on stock volts
    G.Skill Trident-X 2400mhz @ 2400mhz 4x4Gb Quad Channel CAS 9-11-11-31 @ 1.66 volts
    Corsair H100i 240mm Water Cooler (Corsair Link Software is still very glitchy)
    Corsair 600T Silver Mid Tower Case
    Creative xfi Fatality Titanium Pro Sound Card
    2X EVGA GTX 285 2GB Edition in SLI (Old yes but I'm waiting for Q1 2014 for the Nvidia 800 Series before upgrading)
    1X EVGA GTX 260 896mb core-216 running dedicated physX
    Samsung 840 250GB SSD
    Hitachi Deskstar 750GB Sata2 HDD
    Seagate 2TB External USB 3.0 HDD
  7. Do you know how I can contact samsung about this issue. I live in Bangladesh. There is no service center here. I bought this SSD from abroad.
  8. dja0586 said:
    After using that guide my SSD is performing a lot better, but still not as it should. on another note; I ran "AS SSD BENCHMARK" software and it reported a max of 78000 IOPS read where as Samsung's Magician software will only report a max of 68000 at best. And last to note, every time I run the benchmark in Magician the readings swing wildly sometimes bad and sometimes good. This low Read/Write IOPS problem is all over the forums recently for the Samsung 8xx series drives. I'm going to try the add on Sata3 controller on my board because I currently have the SSD running on the Intel's Chipset Sata3 controller, but my motherboard has a Marvell Sata3 controller added on with 4 extra sata3 ports. I'll try one of those and see if it makes any difference and post back.

    The native SATA3 ports are much better than the Marvell-controlled ones.

    As for the lower IOPS, do keep in mind that these are maximums. You cannot count on always getting exactly 94000 when the spec says "up to 94000". 78000 IMO seems close enough not to indicate any problem.
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