David Kanter (dkanter@realworldtech.com) on 1/25/12 wrote:
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>IntelUser2000 (Intel_user2000@yahoo.ca) on 1/25/12 wrote:
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>>David Kanter (dkanter@realworldtech.com) on 1/25/12 wrote:
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>>>IntelUser2000 (Intel_user2000@yahoo.ca) on 1/24/12 wrote:
>>
>>>>I've seen >benchmarks of 2 core Atom
>>>>with Hyperthreading disabled vs Hyperthreading enabled >single core Atom. The 2 core is 30 or so percent faster.
>>>
>>>OK. I'm not sure what that says about A9...actually honestly that tells me that
>>>Intel made a really good choice in terms of hyperthreading.
>>>
>>
>>It's that they need a combination of single thread performance(via clock speed
>>for example) and Hyperthreading to match a dual A9. And >that A15 improves on clock and IPC.
>
>No, I think you're missing the point. Intel's approach is better (assuming they can match 2T perf).
>
>I'd ALWAYS rather have one core with higher frequency and equivalent parallel performance
>through MT. That's a much better solution than two cores which will be slower (in single threaded operation).
>
>Now, if Intel's throughput is lower, then it's a question of how much (and how
>the single threaded performance compares). If Intel's throughput is 10% lower, but
>single threaded performance is 10% better, then I'd say go with Intel for almost any phone.
>
>Of course, the reality is totally unclear because the benchmarks are so questionable.
>
>>Though you have a point about process technology giving >limited improvents when
>>designs are equal, A15 uses a new architecture.
>
>Yes it does, but the architecture is mostly wider (which adds power). It is possible
>it's both wider and lower power, but I'd be very skeptical.

Agreed, moreover Qualcomm has chosen a less risky 28nm LP process without HKMG, so i don't know what will be the final clock speed of this Arm design built in a process not much different versus a well proven 40nm (wafer space apart)
I have the suspect that the first bunch of A15 SOCs will are for tablets.........
I think that Silvermont will be out with 22nm earlier that very low power A15 devices.