Do higher capacity iPhone 4S consume more power?

Discussion in 'iPhone' started by hajime, May 9, 2012.

  1. hajime macrumors 601

    Jul 23, 2007
    Hello. Does the 64GB version of iPhone 4S consume more power than the 32GB and 16GB versions? Are the differences negligible? Thanks.
  2. sammich macrumors 601


    Sep 26, 2006
    There's a difference, and it'll be negligible.

    This is one of those things you just don't consider because the benefits of having the higher capacity outweigh the loss in power by several orders of magnitude.

    Higher capacity means: you have more storage, you can store more things, you have more freedom to store more applications, videos, music without worrying about running out of space.

    Also, you have more space to store things.

    Before I forget, you can't upgrade the storage if you change your mind.
  3. cynics macrumors G4

    Jan 8, 2012
    If there is a difference it's so minute it's not worth concern. This is the first I've heard it mentioned, so there probably isn't a difference at all.
  4. PDFierro macrumors 68040

    Sep 8, 2009
  5. ericrwalker macrumors 68030


    Oct 8, 2008
    Albany, NY
  6. hajime thread starter macrumors 601

    Jul 23, 2007
  7. kdarling macrumors demi-god


    Jun 9, 2007
    First university coding class = 47 years ago
    Of course more memory takes more power. An engineer can always calculate the difference. Heck, anyone can in this case.

    Most Flash memory is made up of separate smaller memory die that are stacked to get more memory in one package.

    For example, looking at NAND Flash specs sheets from Micron, we see that standby current values are:

    4GB = 10-50 ua (1 die)
    8GB = 20-100 ua (2 stacked die)
    16GB = 40-200 ua (4 stacked die)

    Clearly, the standby current must be added up per chip die in the package, and doubles every time the memory doubles.

    However, with standby current measured in microamps (ua), there's not much to worry about since that's a fraction of the power being used for other parts in the device.

    It would only have a noticeable effect if you planned to leave your device sitting uncharged for weeks at a time. E.g. for the 16GB above, that would use max 35mah of battery every week instead of just ~8mah max for the 4GB. Not a huge difference for a 1400mah battery.

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