1. itsnavsub's Avatar
    I recently bought Lumia 640. I am long time user for Lumia 920. The 920 still works and is a great phone. The 920 came with 32 GB on board storage where as 640 has only 8 GB with add on SD card option.

    I plan to add a 32 GB micros SD card for the 640. I plan to use it as an overflow for apps, photos, podcasts, offline maps to name a few. SanDisk seems to be a natural choice for most folks. I saw there are multiple types of SanDisk SD cards on Amazon.

    Option 1 - SanDisk Extreme 32GB UHS-I/U3 Micro SDHC Memory Card Up To 60MB/s

    Option 2 - SanDisk Ultra 32GB UHS-I/Class 10 Micro SDHC Memory Card Up to 48MB/s
    The price difference between option 1 and 2 is not much. But I think option 2 would be more than enough for me.

    The question is does it really make a difference to have a higher read throughput (i.e.) 60MB/s vs 48MB/s? For example game apps loaded on the SD card. How is the performance in that case? Thanks.
    07-03-2015 05:51 PM
  2. Jazmac's Avatar
    Number one should be a good one. Just resist the urge to buy one where this guy shops.
    wile-e-coyote-acme-products-catalog.jpg
    07-03-2015 06:17 PM
  3. shishu1's Avatar
    A little offtopic maybe but you mentioned storing offline maps to SD card. I think that was possible through the app Lumia storage check that was pulled from the store. So it might not be possible now unless you have the app installed before it got pulled(like I had :) )
    07-03-2015 06:20 PM
  4. itsnavsub's Avatar
    A little offtopic maybe but you mentioned storing offline maps to SD card. I think that was possible through the app Lumia storage check that was pulled from the store. So it might not be possible now unless you have the app installed before it got pulled(like I had :) )
    Thanks for the heads up about Offline maps can be saved only on the device storage. I will check and post back here my findings.
    07-03-2015 07:59 PM
  5. OldMillXxX's Avatar
    Sooooo, did you find anything new? In the same boat with my new 735.
    08-06-2015 10:30 AM
  6. Rose640's Avatar
    It doesn't say whether the first SD card is class 10, and really, it's a must. Of course the first one is better choice as long as it is class 10, if not, don't even consider buying it.
    08-06-2015 12:49 PM
  7. miguel11691's Avatar
    I use a class 10 Kingston 64GB and works greats
    08-07-2015 02:28 AM
  8. MATRIX RELOADED's Avatar
    Since the 640 has only 8gb on board memory, I suggest you invest in a 64gb class 10 sdcard so you don't have to worry about storage space later on. More storage will give you peace of mind and more future proof
    08-07-2015 02:43 AM
  9. RiskyAbhi's Avatar
    Hello,
    I have a Samsung Pro micro sd card 64 Gb 90mbps. Its working great on my 1520. And u will get a great deal if u buy if from any store near u. I don't know if its available on amazon.
    08-07-2015 03:17 AM
  10. FancyFreddy's Avatar
    Be very VERY careful ordering SanDisk memory online as there are TONS of junk ones out there.

    I have a 128GB Samsung in my tablet after getting (unknowningly, and then ebay shut down the seller) a fake Sandisk 64GB one. Really poor performance and would not "hold" data. And captured movies were jittery.

    I went back and put a genuine SanDisk in my 640 and it works fine. Just need to get around to picking up another 128GB samsung flash card for the phone. Really like having the extra capacity for pics and video.
    08-07-2015 10:47 AM
  11. Diamond67's Avatar
    I have Samsung UHS-I. And it works great. But...:
    Which microSD cards work with the Microsoft Lumia 640? | Windows Central
    "Side note: A class 4 card may not work because it is to slow. UHS (Ultra High Speed bus) standard is not supported so you will not get 30 or 48 MB/s because the max speed of the HIgh Speed bus in your phone is 25 MB/s." - forums Ambassador Harrie-S
    08-07-2015 05:52 PM
  12. Artie42's Avatar
    It's better to buy a 64 GB Micro SD card or 128GB, I have a Lumia 8 GB device and an 16 GB Micro SD, it seems that windows phone's some temp files can't be cleaned. And the apps are growing.
    08-07-2015 09:58 PM
  13. drhere's Avatar
    I agree, get at least get a 64Gb, I got a SanDisk on sale from Amazon. Flash memory is getting cheaper nowadays, and you can get a good name brand microsd card that is 64Gb or higher at a reasonable price.
    08-11-2015 03:18 PM
  14. DEATH INC's Avatar
    I got a sony UHS-1 class 10 card from amazon for my 640, seems to work great so far.
    08-11-2015 04:49 PM
  15. jdballard's Avatar
    Thanks for the heads up about Offline maps can be saved only on the device storage. I will check and post back here my findings.
    I installed here maps and here drive+ to the phone but was able to move them to the SD card via storage sense. I'll use the maps on the way home today to see if it functions as expected.
    08-11-2015 05:22 PM
  16. itsnavsub's Avatar
    Thanks all for the replies and suggestions. I ended up buying this from Amazon

    SanDisk Ultra 32GB Ultra Micro SDHC UHS-I/Class 10 Card with Adapter (SDSQUNC-032G-GN6MA) [Newest Version]

    As per the description it has
    • Up to 80 MB/s transfer speed
    • Class 10 for Full HD video recording and playback

    So far it is working great.
    libra89 likes this.
    08-20-2015 09:53 AM

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