Apple A12 and A12X SoCs

Discussion in 'Mobile Devices and SoCs' started by iMacmatician, May 7, 2018.

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  1. iMacmatician

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    Apple has announced the A12 Bionic in the new iPhone Xs, iPhone Xs Max, and iPhone Xr during today’s September event.

    [​IMG]

    [​IMG]

    The A12 Neural Engine can perform 5 trillion operations per second, up from the A11 Neural Engine’s 600 billion. (I’m watching the livestream and there was no mention of what precision was used for those numbers.)

    (From the AnandTech live blog.)
     
    #41 iMacmatician, Sep 12, 2018
    Last edited: Sep 12, 2018
  2. wco81

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    Plus didn't they claim they use less energy on those increased operations?
     
  3. Bludd

    Bludd Experiencing A Significant Gravitas Shortfall
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    Funny, It Worked Last Time...
    Isn't the name XS Max a little on the nose? Maximum excess?

    Are they taking the piss and saying that this version is more than necessary?
     
    egoless and milk like this.
  4. Pressure

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    Yeah, Roman numerals can be hard.
     
  5. Bludd

    Bludd Experiencing A Significant Gravitas Shortfall
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    Funny, It Worked Last Time...
    Nobody will call it 10-ess.
     
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  6. wco81

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    So they're citing only 15% increase in CPU performance, 8x performance in their neural engine and 50% increase in the GPU over the A11?
     
  7. Laurent06

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  8. wco81

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    Well compared to the other metrics and compared to the deltas in previous years ...
     
  9. Laurent06

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    Using Geekbench official iOS values for iPhone the delta between A7 and A8 was only +12%. So the claimed +15% would be indeed less than other increases (A11 over A10 was +23%) but not the smallest one.

    A6 -> A7 : 1.68
    A7 -> A8 : 1.12
    A8 -> A9 : 1.70
    A9 -> A10: 1.43
    A10 -> A11: 1.23

    It's like for everything else in this universe: nothing can indefinitely increase :p

    Joke apart I think they are getting close to what makes sense without getting too bad efficiency.
     
  10. wco81

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    I think there was some thought that whatever gains they got from 7 nm, they were using a lot of it for more power efficiency at the cost of greater performance gains.

    But yes, diminishing returns each year.

    The fact that they touted some of these metrics and the fact that it's the first 7 nm chip for mobile devices means that they know they have an advantage, at least for now.

    They haven't always emphasized their silicon but really, they haven't come up with tentpole features to exploit this leading performance either. They showed a lot of games, which aren't going to be huge sellers because they appear to be games which will carry higher price tags.
     
  11. Entropy

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    I look forward to seeing some estimate of how this translates into performance consistency. There is something of a balance to be struck between race-to-sleep and being able to provide consistent performance for those cases that need it.
    Be that as it may, the CPU cores doesn't seem to be the big story here, even though they are quite performant. The GPU (and to some extent the "neural engine") is where the juicy tidbits are hiding.
     
  12. iMacmatician

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    Geekbench 4 results for the A12 are starting to appear.

    According to Bloomberg,
    • The iPhone Xs Max is codenamed D33,
    • The iPhone Xs is codenamed D32,
    • The iPhone Xr is codenamed N84.
    Then from the Geekbench results,
    • The iPhone11,2 has motherboard D321AP and is likely to be the iPhone Xs,
    • The iPhone11,6 has motherboard D331pAP and is likely to be the iPhone Xs Max,
    • The iPhone11,8 has motherboard N841AP and is likely to be the iPhone Xr.
    I have not seen any other iPhone11,x results in Geekbench that were uploaded after the Apple event. Taking the geometric means (I don't know what averaging method is used in the Geekbench benchmark charts) of the scores on or after September 12 gives the following numbers:

    EDIT: New Geekbench scores have appeared since my post that have changed my conclusions drastically.
    • A12, iPhone Xs Max: 4786 single-core, 10934 multi-core (20 results as of this post),
    • A12, iPhone Xs: 4783 single-core, 10996 multi-core (9 results as of this post),
    • A12, iPhone Xr: 4783 single-core, 11010 multi-core (5 results as of this post).
    As with the three A11-based iPhones, the three A12-based iPhones have virtually identical Geekbench scores on average and I think it's safe to assume that they have the same clock speeds.
    Code:
                                    2017 iPhone GB4   2018 iPhone GB4 and change from 2017
    2017 iPhone     2018 iPhone        ST      MT        ST             MT
    
    iPhone X        iPhone Xs Max    4209   10116      4786 (+14%)   10936 (+ 8%)
    iPhone X        iPhone Xs        4209   10116      4783 (+14%)   10996 (+ 9%)
    iPhone 8 Plus   iPhone Xr        4218   10164      4783 (+13%)    11010 (+ 8%)
    iPhone 8        iPhone Xr        4220   10107      4783 (+13%)    11010 (+ 9%)
    
    (The A11 numbers are from the benchmark charts.)

    Old numbers here:
    • A12, iPhone Xs Max: 4773 single-core, 10745 multi-core (12 results as of this post),
    • A12, iPhone Xs: 4749 single-core, 11290 multi-core (5 results as of this post),
    • A12, iPhone Xr: 4754 single-core, 9367 multi-core (1 result as of this post).
    The single-core scores are basically the same, but the multi-core scores for the Xs Max and Xr are 5% and 17% lower than the multi-core score of the Xs. Assuming that the lone result for the iPhone Xr is representative of Xr performance, the A12 in the Xr actually has lower multi-core performance in Geekbench compared to the three A11-based iPhones, which have nearly identical Geekbench scores.
    Code:
                                    2017 iPhone GB4   2018 iPhone GB4 and change from 2017
    2017 iPhone     2018 iPhone        ST      MT        ST             MT
    
    iPhone X        iPhone Xs Max    4209   10116      4773 (+13%)   10745 (+ 6%)
    iPhone X        iPhone Xs        4209   10116      4749 (+13%)   11290 (+12%)
    iPhone 8 Plus   iPhone Xr        4218   10164      4754 (+13%)    9367 (– 8%)
    iPhone 8        iPhone Xr        4220   10107      4754 (+13%)    9367 (– 7%)
    
    (The A11 numbers are from the benchmark charts.)
     
    #52 iMacmatician, Sep 14, 2018 at 9:26 PM
    Last edited: Sep 15, 2018 at 11:43 AM
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  13. Laurent06

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    I wonder if Apple are doing more (too much?) aggressive clock reduction when multithreading.
     
  14. iMacmatician

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    Just my luck, four more Geekbench results for the Xr were uploaded after my post and they have multi-core scores in the ~11500 range.

    With this new information I now think the A12's in all three iPhones are identical.
     
  15. Entropy

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    GFXbench comparison between the iPhone XS and the iPhone X. Improvements are remarkable.
     
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