iPhone GPU power

Discussion in 'iPhone' started by jvpython, Sep 24, 2012.

  1. jvpython macrumors 6502

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    #1
    I wonder how an iPhones 5 / 4S would compare to a laptop in terms of GPU power? Anyone have any idea? I've never seen a benchmark between both a mobile device and a computer...
     
  2. MarcBook macrumors 6502a

    MarcBook

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    #2
    While very impressive for the size and power constraints, the A6 would be pathetic compared to a dedicated computer GPU.

    While I can't quote exact benchmark numbers, I think that a current MacBook Pro (15") is roughly ten times more powerful. That's CPU and GPU power combined; in terms of just graphics, it could be even more than that.

    ----------

    Yeah, I just had a glance at some Geekbench numbers. The iPhone 5 scored around 1600 and a MacBook Pro with Retina display scored around 13500+!
     
  3. jvpython thread starter macrumors 6502

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    #3
    Yeap for CPU power Geekbench clearly shows that a laptop is far far more powerful than the latest iPhone but I was just wondering how the GPU compares...
     
  4. MarcBook macrumors 6502a

    MarcBook

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    #4
    Ah yes, sorry. I always presumed that Geekbench takes graphics power into account, but does it not?

    I have a feeling that a decent NVIDIA GPU would potentially be even more than 10 times as powerful than a phone's GPU!
     
  5. psonice macrumors 6502a

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    #5
    A quick calculation says the GPU in the iPhone 5 (an SGX543MP3 at 266Mhz i believe) can churn out 34GFLOPS. A current high-end desktop video card can take that to >3000, so I guess you can say an iphone has 1-2% of the power a high-end PC has.

    A current-gen, bargain basement bottom-of-the-line desktop/laptop GPU still has 100+GFLOPS, so you're looking at 3x faster even there.

    This is only theoretical performance mind. In practice, platform differences make the comparison very hard. The iPhone is more like say the xbox or playstation for developers - we only have 1 (or at worst 2 or 3) set of hardware to deal with. That means we can optimise like crazy for that particular set of features, and squeeze a whole lot of performance out of it.

    On a PC (or mac) you have a near infinite number of CPU, GPU and memory combinations to deal with, so you can never optimise for all of them - in fact often you're just optimising for the lowest platform you can, and throwing some extra stuff in to please people with high-end machines. Most of the time you get nowhere near the hardware limits.

    By the way, the Atom chips from intel actually contain a GPU that's pretty similar to the iphone's. They use the same SGX series, but different parts, and at much higher speeds. I don't think they use multiple GPU cores though, so it's entirely possible that an iphone 5 considerably outperforms a netbook for graphics!
     

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