64GB SanDisk Ultra microSDXC UHS-I Class 10 Card Review

I am glad that Samsung Galaxy S III supports micro SD card up to 64GB. So I can have excuse to buy 64GB SanDisk Ultra microSDXC UHS-I Card (Class 10) and put on it. 64GB SanDisk Ultra microSDXC UHS-I Card (Class 10) can achieve speeds up to 30 MB/s (30MB/s read speed; write speed lower), has class 10 speed rating and UHS Speed Class 1 (U1) enabled. Besides, it is also water-proof, temperature proof, X-ray proof and shock proof. How does it perform? Let’s find out…

64GB SanDisk Ultra microSDXC UHS-I Class 10 Card

With adapter, it is a full-sized SD card

Performance Results

64GB SanDisk Ultra microSDXC UHS-I Class 10 Card manages to get read speed of 40 MB/s sequentially. 10MB/s over the 30 MB/s set by SanDisk. Cool… However, the sequential writing speed is much much lower at 13.92 MB/s. But still fulfills as a class 10 card.

Performance at Samsung Galaxy S3

As expected, Samsung Galaxy S3 micro SD card slot is not UHS-I enabled. So 64GB SanDisk Ultra microSDXC UHS-I Class 10 Card performance is lower on Samsung Galaxy S3. Only get 17.94 MB/s sequential reading speed and 9.35 MB/s sequential write speed.

64GB SanDisk Ultra microSDXC UHS-I Class 10 Card is a nice addition to your smartphone. It has high reading speed. This will surely shorten file transferring time.

Interested? You can grab one here.


  1. Hey Jayce,

    Which customs ROM are your using on your S3 as daily ROM now ? Could you give some recommendation ?


      • Officially. Don’t ask me how, but lots of people and reviews, both professional and those done at home prove it is possible. AFAIR user needs to reformat the card in the phone, don’t ask me for details, but you can find the method in the reviews. It’s quite easy to find those, actually. GL.

  2. @Jayce

    Checkrom have released their own 4.04 ICS ROM (finally!). It’s very quick and stable. Kitchen works the same as before, with the option to reinstall apps taken away by the rom (most of which are bloat). Give it a review for other users πŸ™‚

  3. Have you got a sdhc class 10 card that you could test in your galaxy s3?
    Would be interesting to see the read/write speed compared with the UHS-1 card.
    I think the speed classification of memory cards is a joke, there’s no way of telling how fast the read/write speed will be until you try it in your device. A UHS-1 card can write at 9.35MB/s in your S3 but also at 82.25MB/s in a USB3 card reader as shown in this review http://www.legitreviews.com/article/1972/2/

  4. ppl r said no different.. c’mon there sure got different.. sumore mobile ultra nvr stated class 10 on the sd there.. thanks bro..

  5. they stated class 10 but actually class 6 only.

    SDSDQY-064G-U46A (class 6)

    SDSDQUA-064G-U46A (class 6) “mobile ultra” *package EU

    SDSDQUA-064G-A11A (class 10) “ultra”

    • SDSDQUA…. UA at end indicates Class 10
      SDSDQY…….Y at end indicates Class 6

      Therefore SDSDQUA-064G-U46A is a Class 10 card. I have this one and it has faster speed test than the one in this review

      Writing: 300MB at 16.68 MB/s
      Reading: 301MB at 28.88 MB/s (very close to advertised 30 MB/s max. read speed)

  6. Hey Jayce,

    are you experiencing any lag or loading time in your app screen because of the memory card or does it work flawless? i’m seriously thinking of buying the same sd card for my galaxy note 2. i remember in my previous phone that it takes a while to load the app screen especially when the apps are stored in the sd card

  7. My S3 killed my 32GB sandisk class6.. Have someone has got the same issue as I am? S3 kills sd card.. Keep showing sd card removed unexpectedly..

    You could go search for google : s3 kills micro sd

    A lot of results showing that their s3 kills their microsd.. sad πŸ™


Please enter your comment!
Please enter your name here