xps l521x slow msata port? - General Hardware - Laptop - Dell Community

xps l521x slow msata port?


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xps l521x slow msata port?

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So other than the obvious wifi and overheating issues with this laptop, I may have another issue and am reaching out to all the xps 15 (l521x) with an msata ssd as their boot os owners.

I purchased an adata xpg sx301 256g msata, its transfer speed should be near the 550MB.
im using it as my os boot location, windows 8 uefi and its runs fine, boot time 4.5s

the issue is, I ran tests and its read speeds are where they should be, however its Sequential write speed is very low compared to where it should be(and all the other write speeds), I emailed adata and they said that it could be a problem with my laptop. Can some of you run crystal mark so I may compare and see if it is indeed a limitation set by the motherboard. (chkdsk comes back without error)

 Dear Elvis,

 Thank you for contacting ADATA USA. 

The transfer rates vary on the type of data being transferred, also each system configuration will have a different transfer rates.

 We recommend using ChkDsk to verify if the drive has any bad sectors which may be causing the slow transfer rates. If the drive does not bad sectors we recommend checking with Dell for troubleshooting, you may have a compatibility issue.


CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo

                           Crystal Dew World : Crystal Dew World


* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :   445.302 MB/s
          Sequential Write :   136.033 MB/s
         Random Read 512KB :   370.312 MB/s
        Random Write 512KB :   132.622 MB/s
    Random Read 4KB (QD=1) :    15.021 MB/s [  3667.2 IOPS]
   Random Write 4KB (QD=1) :    56.283 MB/s [ 13740.9 IOPS]
   Random Read 4KB (QD=32) :    83.095 MB/s [ 20286.9 IOPS]
  Random Write 4KB (QD=32) :   130.943 MB/s [ 31968.5 IOPS]

  Test : 4000 MB [C: 21.6% (51.4/238.0 GB)] (x5)

  Date : 2013/11/14 23:24:29

    OS : Windows 8.1  [6.3 Build 9600] (x64)

All Replies
  • does no one have an msata ssd as their boot or at least as a storage drive?

  • I have the same problem with you, as my system configuration is below:

    Dell XPS 15 (L521x)

    Windows7 x64 w/ service pack1

    Plextor PX-128M3 SATA/6g SSD + Samsung PM830 32G mSATA


    Its only run under SATA/3g, but it should be run under SATA/6g...

  • Most mSATA ports are 3G, not 6G.

  • Yes, it's,

    but I replaced original hard disk to Plextor PX-128M3 SSD (connected to main SATA port, not mSATA port), it also run under SATA/3g,

    I had check all kinds of configuration related but still have no idea about that...

  • Did anyone ever figure out why this is running at 3g and not 6g?

    According to this post the correct chipset is on the system and has full support for 6g.  I am guessing there is a setting somewhere to turn on the turbo?


  • ejn63

    Most mSATA ports are 3G, not 6G.

    This is not correct according to the chipset on the l521x


  • What the chipset supports doesn't matter - it's what the mainboard supports, and most notebooks with mSATA support are capped at 3 GBps -- at least the early ones such as this one, are.

  • Hi

    I'm guessing you're on the latest BIOS

    They disabled the faster protocol in the latest BIOS(A16 I think)

    What i did is revert back to A15 (1 version backwards) and it seems to have fixed the problem.

    Now, the thing shows up as sata 6