A7 performance - equivalent desktop cpu?

Discussion in 'iPhone' started by heifetz7, Oct 3, 2013.

  1. heifetz7 macrumors member

    Oct 5, 2011
    There's a lot of benchmarks on A7 performance versus other mobile cpus. But I can't find anything comparing the A7 against desktop CPUs, and where it falls. It'll be interesting to see what desktop CPUs have the same performance as the A7. Has anyone seen this?
  2. pmau macrumors 65816

    Nov 9, 2010
    Clock rates and transistors draw power.
    Consider the battery size of a phone compared to a MacBook Air, etc.
    It would not be a problem to make the ARM A7 as fast as a desktop CPU.
    It's all about power consumption, transistors, etc.

    The A7 is a CPU for a specific purpose designed to work in constraint environments. The comparison would be pointless.
  3. Gav2k macrumors G3


    Jul 24, 2009
    Geekbench score wise from there site places it just a shade faster that an Intel Core 2 Duo E4400@ 2ghz but honestly comparisons of CPUs of different classes just don't add up.
  4. cynics macrumors G4

    Jan 8, 2012
    Where the 5S scores in the thousands on geek bench score a modern computer scores in the tens of thousands and a computer is pushing around infinitely more pixels.

    But like mentioned this isn't a fair comparison. Size and cooling play major rolls in this stuff.

    Basically the iPhone isn't a desktop computer so it's apples to oranges.
  5. mtneer macrumors 68030


    Sep 15, 2012
    There's been quite a bit of talk about this, however I have not seen a head-to-head stackup of performance scores versus Intel's Core and Xeon processors. If the A7 is able to get into that field with the Haswell Cores and Ivy Bridge Xeons, then the cat will be amongst the pigeons..
  6. Menel macrumors 603


    Aug 4, 2011
    Define equivalent desktop CPU...

    Intel Atom? AMD A4-5000?

    Such as used in this Laptop?


    See Anandtech's 5S review


  7. sillywabbit macrumors 6502a

    Nov 10, 2012
    I have heard the a7 64 bit chip is just a gimmick. Reason: you need at least 4 GB of RAM to actually and truly effectively utilize 64 bits.
  8. cynics macrumors G4

    Jan 8, 2012
    I've heard that but only on forums. I'd like to see a detailed link on the subject from a reputable source.
  9. KPOM macrumors G5

    Oct 23, 2010
    It's of limited usefulness, though certain mathematical calculations are faster on a 64-bit processor. That said, A7 is a big deal because it moved to a much more efficient ARM processor architecture. Think of the difference between the Core 2 Duo and the original Core i3/i5/i7. A "slower" Nehalem Core i5 runs circles around a Core 2 Duo with a higher clock speed.
  10. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC

    There you go. It requires a fair bit of reading, but if you're not willing to put in that much time then you probably shouldn't be telling people about processor architecture on message boards.

    (The conclusion, for those of you not wanting to read it all: The "64-bit" A7 is not just a marketing gimmic, but neither is it an amazing breakthrough that enables a new class of applications. The truth, as happens often, lies in between.)
  11. aneftp macrumors 601

    Jul 28, 2007
    Bottom line?

    Is the A7 about the same as a desktop/laptop processor circa 2006?

    Let's keep it that simple?

    Laptop processors didn't really catch up to desktop processors until probably 5-6 years ago either.

    I don't think mobile phone processors will ever be the same as desktop/laptop processors but maybe they can be 2-3 years behind?
  12. gigapocket1 macrumors 65816

    Mar 15, 2009
    I completely agree with this statement. There's no way that an iPhone processor or a mobile processor for that matter can compete with present day computer desktop or laptop processors. But maybe if you compare the a7 chip to the core two duo or something earlier than that then comparison can be kind of close
  13. MH01 Suspended


    Feb 11, 2008
    CPUs increase in performance.... 5 years from now we will be looking back how slow the A7 is and how amazing/fast the new CPUs are.
  14. iAlphard macrumors regular

    Aug 29, 2012
    Mobile phone processor can be as fast as desktop processor, even today. The big problem is the power source powered them. You can run A7 at full speed throttle, but it will only last like 1-2 hours usage. Battery tech is stagnant atm, it's still lithium ion afterall. We need nuclear battery now.
  15. Menel, Oct 3, 2013
    Last edited: Oct 3, 2013

    Menel macrumors 603


    Aug 4, 2011
    Wrong order of logic. Backwards.

    You need 64bit to effectively address and utilize 4GB of RAM or more.

    That is only one of many 64bit benefits.

    "Desktop Class" cpu in feature-set, not performance.

    You could maybe compare performance/watt.


    Nuclear batteries have incredibly low power output.

    A quick google revealed a Lockheed prototype from a few years back providing 25 nanoWatts of power. 25nW!

    iPhone currently has a 3.8V, 5.73 WHr battery that provides 10 hours of usage. I think measning 573mW of power draw for 10 hours would get you roughly 5.73 WHr.

    Compare 573,000 nW of needed usage to a 25 nW battery supply.
  16. scaredpoet macrumors 604


    Apr 6, 2007
    It's actually the other way around: you need 64-bits to "actually and truly" use more than 4GB. Even so, you can still take advantage of 64-bit features without a huge amount of RAM

    The truth is though, there isn't a huge advantage to using a 64-bit chip right now, but there will be in the future. It's a chicken-or-egg situation: to take advantage of a 64-bit processor, you need 64-bit apps. But you can't have 64-bit apps without a 64-bit processor. So Apple has to take the first step: start selling phones with 64-bit processors, so that app makers can start developing for it.
  17. asleep macrumors 68040


    Sep 26, 2007
    Not a gimmick, but...


  18. GoSh4rks macrumors 6502

    Sep 14, 2012
    Should have quoted the immediately following line too:

  19. Mrbobb macrumors 601

    Aug 27, 2012
    Suffice to say 64 bit is more evolution than revolution. Deskto performance? That sounds like marketing-speak.
  20. Matt8045 macrumors regular

    Mar 2, 2012
    My MacBook Air late 2012 scored 5560 on geek bench :/
  21. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC
    But then I'd be quoting the reasons why it doesn't matter and ignoring the reasons why they went ahead and did it. (Which do exist, as you'll see from the part I did quote: " The truth, as happens often, lies in between.")

    Doing that would be a disservice to the MacRumors community. If anyone actually cares, they'll read the link and get the whole story. Me trying to slant the opinion of those who don't read it serves no purpose.
  22. JulianL macrumors 65816

    Feb 2, 2010
    London, UK
    Just for laughs that's the desktop comparisons that I'd be interested in, i.e. "the A7 has about the same computational performance as Intel's top of the range desktop CPU, the <CPU Model>, that was released in <Year>".

    I'd be quite interested to know what CPU model and release year would be the most appropriate ones to fill in those blanks.
  23. klepp0906 macrumors regular

    Sep 11, 2014
    This will be my new sig lawl
  24. HarryWild, Oct 30, 2014
    Last edited: Oct 30, 2014

    HarryWild macrumors 65816


    Oct 27, 2012
    The Apple A7 SoC would have to back 10 years or more and get close to the performance of a desktop Intel or AMD CPU! I am talking the low end of the desktop to like the Celeron class! LOL!

    Intel Atom CPU is in netbooks! It similar to that of an tablet CPU; not a desktop or even notebook!

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