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  1. WasteSomeTime's Avatar
    Like the title says. Is it as fast? Or getting a class 4 give the same results?
    11-12-2013 07:08 PM
  2. azcruz's Avatar
    Class 10 = 10MB/s, so no.

    UHS I = 50MB - 100MB
    UHS II = 310MB

    The Surface does not use UHS bus AFAIK.
    11-12-2013 07:21 PM
  3. N_LaRUE's Avatar
    Class 10 = 10MB/s, so no.

    UHS I = 50MB - 100MB
    UHS II = 310MB

    The Surface does not use UHS bus AFAIK.
    Were they asking about Surface or WP or just in general?
    11-13-2013 04:08 AM
  4. WasteSomeTime's Avatar
    I guess I should have just said windows phone.
    11-13-2013 10:25 AM
  5. azcruz's Avatar
    I use Class 6 on all my devices, Xperia V, HTC 8S, Surface RT, and it is enough for *my* needs.
    11-13-2013 11:03 AM
  6. WasteSomeTime's Avatar
    But is it as fast the time it takes to access flash memory files?
    11-13-2013 06:47 PM
  7. azcruz's Avatar
    I believe I answered that question already.
    11-13-2013 07:42 PM
  8. Neusyn's Avatar
    From what I've seen it really depends on the device and card. Quite a few devices will not see much or any improvement above class 6. Afaik Nokia Lumia also are no exception so I'd say save money and get a class 6.
    11-13-2013 08:16 PM
  9. WasteSomeTime's Avatar
    I believe I answered that question already.
    You did . . . Solely based on * your * needs, not mine. I want the to squeeze out all the performance I can to make it feel the same as accessing flash memory.
    11-14-2013 04:31 PM
  10. xandros9's Avatar
    in general use, it shouldn't matter much. now if you were doing some heavy lifting on a timetable like running big programs of the card (in Surface for example), or needing to rapidly move and work with media ASAP, go for it.
    11-14-2013 04:49 PM
  11. RustyU's Avatar
    Simply put: No.

    EMMC beats the crap out of SD.
    11-14-2013 06:18 PM
  12. azcruz's Avatar
    You did . . . Solely based on * your * needs, not mine. I want the to squeeze out all the performance I can to make it feel the same as accessing flash memory.
    Sorry if I was vague, I was referring to my reply of
    Class 10 = 10MB/s, so no.
    As an example, my mid-range HTC8S using the MSM8227 SOC use dual-channel LPDDR2-800 at 12.6GB/s
    11-14-2013 07:31 PM
  13. Moiz Mian's Avatar
    I can't believe this hasn't been answered yet. I don't have a micro usb cable on me, but connect your phone to your laptop and try dragging and dropping a file from your laptop to your device and back, and then report your speed of both here. That will give you read/write times.

    I personally think that the speed of a high speed class 10 will be similar. I have a 32GB 30MB/s microSD card that I bought from amazon for like $25.The internal memory should also be about 30MB/s
    11-14-2013 09:01 PM
  14. Moiz Mian's Avatar
    Ok, I just ran a read/write test. If anyone else wants to confirm, I'm getting 12.5MB/s write and 18MB/s read. That's about equal to class 10. Remember class 10 means MINIMUM of 10MB/s.

    Amazon.com: SanDisk Ultra 32 GB MicroSDHC C10/UHS1 Memory Card with Adapter (SDSDQU-032G-AFFP-A): Electronics

    This is what I have, and it is faster than the internal memory. 30MB/s
    11-15-2013 02:28 AM
  15. Moiz Mian's Avatar
    Simply put: No.

    EMMC beats the crap out of SD.
    No, while EMMC might be faster, it's bottlenecked by the transfer mechanism, which is usually crap on cellphones and tablets.
    11-15-2013 02:29 AM
  16. anony_mouse's Avatar
    Sorry if I was vague, I was referring to my reply of As an example, my mid-range HTC8S using the MSM8227 SOC use dual-channel LPDDR2-800 at 12.6GB/s
    Just to note that is the speed the bus operates, not necessarily the speed of the memory. It's a theoretical maximum.
    Also DDR is used for connecting dynamic memory (i.e. RAM), not flash, so isn't relevant here.
    11-15-2013 09:13 AM
  17. Guzzler3's Avatar
    I can't find the web page anymore, but I do remember that WP devices are supposed to use UHS compliant microSD cards (if a microSD slot is used) to be "certified' by Microsoft as a compliant device to run the WP operating system.

    Now the fun part. You can have a microSD card that is Class 6, but is also UHS 1. Meaning that if you put it in a device that is using the old bus technology (aka Class) you will get a transfer rate of a minimum of 6 Mb/s. But put the same card in a device that uses the newer bus technology (aka UHS) you will get a transfer rate of at least 10 Mb/s.

    Even more fun. Class and UHS speeds are spec'd as minimum speeds to be certified. So a UHS 1 class card with always get you at least 10 Mb/s. But it could be faster, depending on the manufacturer and how well they make the card, up to 30 Mb/s. Then the card is certified as a UHS 3 card.

    Same goes for Class ratings. As soon as the cards transfer rate increases enough to the next level (2 -> 4 -> 6 -> 10).

    So...what you should take out of this, is to stop shopping via the "Class" rating and look at the "UHS" rating for microSD cards for Windows Phone.
    Last edited by Guzzler3; 11-15-2013 at 12:09 PM.
    11-15-2013 11:58 AM
  18. Guzzler3's Avatar
    Another thing about testing card speeds via a PC. Don't. For some reason most PC makers don't put the SD card reader on a fast bus inside the PC (minimize costs possibly). Tom's Hardware researched this awhile back and came up frustrated at the transfer rates. The all maxed out a set rate, even if the card was rated at a higher speed.

    It's only device manufacturers (phones, cameras, etc.) that spend the extra money to put the SD reader on fast buses.
    11-15-2013 12:17 PM

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