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    M18x R2 USB 3.1 Speeds

    Discussion in 'Alienware 18 and M18x' started by maxslo, May 24, 2017.

  1. maxslo

    maxslo undefined

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    I recently bought the Sandisk Extreme Pro 3.1 128GB USB, ofc first thing i did when it arrived was check the promised speeds, to see if they match the advertised...

    To my dissapointment i found that the USB barely reaches 250MB/s read/write speeds.
    Advertised: 420MB/s read & 380MB/s write.
    I tested on all four ports and the result was the same.
    I even tested it with the E6530, no dice.

    I am thinking Ivy Bridge might have some limitation or i got a lemon? (Feels like running S3 SSD on S2 port)
    Has anyone else tested their USB 3.1 speeds before?
     
    maxslo, May 24, 2017
    #1
  2. Tulius

    Tulius Notebook Consultant

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    The M18X-R2 doesn't have 3.1 USB ports, only the old 2.0 and 3.0 ones, that's why you can't achieve the proposed usb 3.1 speeds,
     
    Tulius, May 24, 2017
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  3. maxslo

    maxslo undefined

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    Actually it does... the USB 3.0 is infact USB 3.1 Gen 1 ...
    The USB 3.1 that you had in mind is actually USB 3.1 Gen 2.
    USB 3.0 -> later renamed to USB 3.1 Gen 1 is capable of 5GB/s (roughly 500MB/s), so in my opinion 420/380 of this USB shouldnt be a problem...
     
    maxslo, May 24, 2017
    #3
  4. Raidriar

    Raidriar ლ(ಠ益ಠლ)

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    As tulius stated, m18x r2 only got usb 3.0 on 4 hubs and 2.0 on the esata combo port.

    however, usb 3.0 is rated for 5gbps which is around 625MBps so something is still not right here .
     
    Raidriar, May 24, 2017
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    maxslo likes this.
  5. maxslo

    maxslo undefined

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    Exactly, I'm gonna put an SSD into USB 3.1 Enclosure and retest when i get the time, it would be really dissapointing if the USB speed is capped at 250MB/s
     
    maxslo, May 24, 2017
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  6. aaronne

    aaronne Notebook Evangelist

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    what OS are you using?

    Because on my Win7x64 I got Nando's modded drivers (SATA and USB3.0) and I noted a performance increase over my ssd and usb write/read.
     
    aaronne, May 25, 2017
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  7. maxslo

    maxslo undefined

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    Same, Win 7 x64... would you mind posting a link to those drivers? :)

    Sent from my LG-H850 using Tapatalk
     
    maxslo, May 25, 2017
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  8. aaronne

    aaronne Notebook Evangelist

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    Last edited: May 25, 2017
    aaronne, May 25, 2017
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  9. Raidriar

    Raidriar ლ(ಠ益ಠლ)

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    Raidriar, May 25, 2017
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  10. aaronne

    aaronne Notebook Evangelist

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    I did not make a screenshot at time, but with standard m18xR2 drivers, both samsung magician and atto result's was not aligned to how 850Evo supposed to.
     
    aaronne, May 25, 2017
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  11. Tulius

    Tulius Notebook Consultant

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    The drivers listed above are working on Windows 10 or only for Win7?
     
    Tulius, May 25, 2017
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  12. GodlikeRU

    GodlikeRU Notebook Deity

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    In most cases you won't get desired maximum USB bandwith. Chip gives it's overhead, there are drivers etc. You won't ever get maximum bandwith. This score is pretty good.
     
    GodlikeRU, May 26, 2017
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  13. maxslo

    maxslo undefined

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    With the modded drivers and unlocked A11 i've seen an increase of 10MB/s on both read and write speed, but thats inside a margin of error..

    I've put a 512GB ssd in a 3.1 case and the case is super crippled, max 200MB/s when the SSD runs well over 400MB/s directly on SATA3

    Gonna need to try the USB on a different (newer machine)... :/
     
    maxslo, May 30, 2017
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  14. maxslo

    maxslo undefined

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    Ok, a buddy of mine tested the USB on his Ryzen machine and the usb is performing exactly as it should (420 read / 380 write).
    Dont wanna be pointing fingers but the culprit (bottleneck) seems to be the Ivy Bridge USB 3.1 Gen 1.
    Sucks to be missing 50% of the bandwith of a USB 3.0 / 3.1 Gen 1... :/
     
    maxslo, Jun 6, 2017
    #14