Mobile Device vs Laptop Performance Gap

BaldiMac

macrumors 604
Original poster
Jan 24, 2008
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Has anyone seen any graphs or tables comparing the performance trends of mobile devices such as the iPad to traditional laptops? Is the gap shrinking? How fast?
 

jeremyshaw

macrumors 6502
Oct 29, 2011
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It's not shrinking at all. Laptop have around, commonly 100W limit. Though can go to 300W in larger ones. Tablets? Maybe 4-5W. And until newer architectures focus on hitting a very low peak power, then it's going to stay that way.
 

BaldiMac

macrumors 604
Original poster
Jan 24, 2008
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It's not shrinking at all. Laptop have around, commonly 100W limit. Though can go to 300W in larger ones. Tablets? Maybe 4-5W. And until newer architectures focus on hitting a very low peak power, then it's going to stay that way.
How does that relate to overall performance? I kinda expected an answer in flops or some general benchmarks. Power consumption appears to be tangential to the topic.

For example, it seems obvious to me that browsing performance on mobile devices have become much closer to laptops in the last year. Of course, that is just one aspect of the overall performance of the device.
 

Stealthipad

macrumors 68040
Apr 30, 2010
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Performance?

Performance in what terms. In what way are you wanting to compare these two items for performance?
 

jeremyshaw

macrumors 6502
Oct 29, 2011
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How does that relate to overall performance?

For example, it seems obvious to me that browsing performance on mobile devices have become much closer to laptops in the last year. Of course, that is just one aspect of the overall performance of the device.
That has more to do with browser SW becomming more efficient, GPU rendering and threading, in particular. Otherwise, you are looking at some rather comparible architectures. If you WERE to compare them.... in terms of compute, the iPad 2 SoC gets around ~15 GFLOPS in theory? The lowest end IGP currently in a modern computer, the HD6250, gets about 44GFLOPS. For another, unrealistic reference, the HD6990m (the mobile version of the HD6870 desktop card), gets 1.6 TFLOPS, or 1,600 GFLOPS. The Fastest desktop single GPU? the HD7970 gets a wonton 3.7 TFLOPS.

However, that is not directly comparible, as the HD6250 has more memory bandwidth (though the SGX is TBR to help negate that sizeable advantage...), MUCH improved texture filtering systems, and much better geometry performance then the raw compute power difference would suggest.

In terms of percieved performance? Probably close. In terms of actual performance? That was the lowest end IGP, and it soundly trounces the A5 GPU in all but power consumption (even so, the HD6250 has a more power efficient vesion that is on a faster chip, too!)
 

BaldiMac

macrumors 604
Original poster
Jan 24, 2008
7,411
7,497
Performance?

Performance in what terms. In what way are you wanting to compare these two items for performance?
Nothing specific. Just wondering if some information is out there. Either some general benchmarks or processor performance (gigaflops). Something to define the overall performance gap between mobile device and laptops and how it has changed over time.
 

BaldiMac

macrumors 604
Original poster
Jan 24, 2008
7,411
7,497
That has more to do with browser SW becomming more efficient, GPU rendering and threading, in particular. Otherwise, you are looking at some rather comparible architectures. If you WERE to compare them.... in terms of compute, the iPad 2 SoC gets around ~15 GFLOPS in theory? The lowest end IGP currently in a modern computer, the HD6250, gets about 44GFLOPS. For another, unrealistic reference, the HD6990m (the mobile version of the HD6870 desktop card), gets 1.6 TFLOPS, or 1,600 GFLOPS. The Fastest desktop single GPU? the HD7970 gets a wonton 3.7 TFLOPS.

However, that is not directly comparible, as the HD6250 has more memory bandwidth (though the SGX is TBR to help negate that sizeable advantage...), MUCH improved texture filtering systems, and much better geometry performance then the raw compute power difference would suggest.

In terms of percieved performance? Probably close. In terms of actual performance? That was the lowest end IGP, and it soundly trounces the A5 GPU in all but power consumption (even so, the HD6250 has a more power efficient vesion that is on a faster chip, too!)
Thanks for the information. Of course, a laptop trounces an iPad at this point in raw performance! I'm wondering how the gap is changing over time.
 

jeremyshaw

macrumors 6502
Oct 29, 2011
340
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Thanks for the information. Of course, a laptop trounces an iPad at this point in raw performance! I'm wondering how the gap is changing over time.
Well, effectively, both sides are pushing the limit of manuf process (around the same pace, too). Now, it's almost sheer architecture that is making the difference. In terms of smartphones, tablets? Yes, they have caught up greatly in the past 5 years. However, both lineups have, effectively, hit a limit as to how fast they each can be (power consumption and the directly related heat output), per process node (currently 28nm and 32nm; though still transitioning from 40/45nm). Until an architecture is designed, that is not scaleable, yet extremely powerful to the point of negating all other products, this divide will always exist around the level it does, now.
 
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