Performance comparison of eMMC and micro SDXC UHS-1

Discussion in 'Asus' started by testplayer, Mar 23, 2014.

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  1. testplayer

    testplayer Scribbler - Standard Member

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    Did anybody try the read/write speed of the eMMC internal drive of VivoTab Note 8? What is the interface speed of the micro SD card reader? The sandisk extreme version micro SD card claimed a read/write speed of 80/50 MB/s, is this comparable to the internal eMMC drive?
     
  2. ananimus

    ananimus Pen Pal - Newbie

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    Only have a Class 4 here, but here you go, from CrystalDiskMark:

    diskmark.jpg

    Sequential speeds of eMMC definitely compare to UHS-1.
     
  3. tijo

    tijo Scribbler - Standard Member Senior Member

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    I can't test the Vivotab, but I can give you results for what a class 10 microSD will give you if the card reader is hooked through PCI-E. It's a 64 GB class 10 ADATA SDXC card by the way. Now, the thing is that it is quite likely that the microSD card reader in your vivotab is USB2.0, in which case, performance will be much lower. animus' results surely looks like USB2.0 scores, but given that he tested using a class 4, it's hard to tell which was really the limiting factor here, microSD or card reader interface. I would actually bet on it being USB2.0, but until someone actually tests it with something like a class 10, it won't be easy to tell.
    CDM_uSD.jpg

    For the sake of comparison with other eMMC, here is the score for my Q584
    View attachment 5743

    And that of the TPT2 and same microSD in the TPT2's card reader
    CDM_TPT2.jpg

    Anyways, it would be interesting to make a comparison of eMMC from various Windows tablets thread and at different storage capacity.
     
    Last edited: Mar 23, 2014
  4. testplayer

    testplayer Scribbler - Standard Member

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    My point is that, if the micro SD card is fast enough compared to the eMMC, then I only need to buy the 32GB version of VivoTab Note 8. But just as tijo mentioned, if the card reader interface is usb 2.0, then it'll be meaningless.
     
  5. Quark999

    Quark999 Pen Pal - Newbie

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    I'm sorry to say that the speed of the SD Card is indeed limited by USB 2 - I had the same concerns than you and was wondering which SanDisk I should be going with, and I'm glad I didn't opt for the one with the highest write speeds (Extreme Pro I think, I get confused by the nomenclature), and instead for the slightly slower, but also cheaper one, as they are all slowed down by the card reader anyway.

    Having said that the SD card is definitely usable even if it's slightly slower than I'd like it to be and I do use it as a replacement for the SSD, provided you go for one that can manage to max out both USB2 reads and writes - not many do to begin with.
     
  6. alexb2611

    alexb2611 Pen Pal - Newbie

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    I remembered I did this quick comparison a few weeks ago:

    eMMC:

    Sequential Read : 77.741 MB/s
    Sequential Write : 34.945 MB/s
    Random Read 512KB : 69.696 MB/s
    Random Write 512KB : 27.311 MB/s
    Random Read 4KB (QD=1) : 8.352 MB/s [ 2039.1 IOPS]
    Random Write 4KB (QD=1) : 5.097 MB/s [ 1244.4 IOPS]
    Random Read 4KB (QD=32) : 18.447 MB/s [ 4503.7 IOPS]
    Random Write 4KB (QD=32) : 7.160 MB/s [ 1748.0 IOPS]

    Test : 100 MB [C: 54.2% (15.3/28.2 GB)] (x1)
    Date : 2014/03/01 8:34:16
    OS : Windows 8 [6.2 Build 9200] (x86)


    64GB Class 10 UHS-1 microSD:

    Sequential Read : 23.673 MB/s
    Sequential Write : 15.861 MB/s
    Random Read 512KB : 23.350 MB/s
    Random Write 512KB : 15.700 MB/s
    Random Read 4KB (QD=1) : 7.875 MB/s [ 1922.6 IOPS]
    Random Write 4KB (QD=1) : 3.462 MB/s [ 845.2 IOPS]
    Random Read 4KB (QD=32) : 8.871 MB/s [ 2165.8 IOPS]
    Random Write 4KB (QD=32) : 3.624 MB/s [ 884.8 IOPS]

    Test : 100 MB [D: 0.0% (0.0/58.5 GB)] (x1)
    Date : 2014/03/01 8:37:11
    OS : Windows 8 [6.2 Build 9200] (x86)

    Cheers,
    Alex
     
  7. tijo

    tijo Scribbler - Standard Member Senior Member

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    I guess we can conclude that the card reader is USB2.0. That said, unless you plan on oing heavy I/O on the microSD (which you shouldn't be doing in the first place), you will be fine for pretty much anything at USB2.0 speeds.

    If it makes anyone feel any better, I have yet to see a card reader go over USB2.0 speeds on any atom Windows tablet.
     
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