ARM announces A72

By: Exophase (, February 7, 2015 10:47 am
Room: Moderated Discussions
Alberto ( on February 7, 2015 11:22 am wrote:
> Umm yes, because they not say if the IPC increase claim is "mostly 10%" or "mostly 50%"
> :), neither they say if the sustained increase in performance at the same power is "up to"
> or "in average" or "in some lucky cases" or "in most cases" etc.....they are vague.
> And yes some informations on test are welcomed.

Peter's descriptions were clear and unambiguous, but obviously he is operating outside of official releases and there's a limit to what he can say - like giving large data sets of benchmark results. But I doubt anything would really be good enough for you.

> Still i think the gain is mainly in the power management, not so strong in both A15 and A57.

How exactly does a change in power management result in an increase in IPC by 10-50%? If all of the performance was gained by an increase in clock speed enabled by a decrease in power consumption you may have an argument, but that is clearly not the case.

> This time they have worked like Qualcomm have done with its very power efficent Krait core line???

Krait gets all this praise for being so power efficient but I have yet to see a real comparison with normalized performance on the same process and all that. All I've seen is comparisons where A15 uses more power (sometimes a lot more) while also performing better (sometimes a lot better). I repeat it constantly, but perf/W is not linear and these comparisons are meaningless. Reduce the clock speed on the A15 until it matches the performance on the Krait core and then do a fair measurement - of course, this will vary tremendously from benchmark to benchmark, especially since Krait appears to have some big glass jaws.

What we do know is this: despite your remarks that power management is "not so strong" in A57 Qualcomm still preferred to use it instead of a version of Krait that only added ARMv8 support, something I'm sure they could have done in time if it would have given them such an advantage.
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TopicPosted ByDate
ARM announces A72Maynard Handley2015/02/03 11:36 AM
  ARM announces A72anon2015/02/03 12:53 PM
    ARM announces A72Hugo D√©charnes2015/02/03 01:20 PM
      ARM announces A72juanrga2015/02/03 04:15 PM
        ARM announces A72Wilco2015/02/04 12:58 AM
          ARM announces A72Eric Bron2015/02/04 01:48 AM
            ARM announces A72none2015/02/04 02:24 AM
              ARM announces A72Eric Bron2015/02/04 02:42 AM
                ARM announces A72Exophase2015/02/04 07:01 AM
                  ARM announces A72Anon2015/02/04 07:35 AM
                    ARM announces A72Exophase2015/02/04 07:58 AM
                      ARM announces A72Groo2015/02/04 09:24 AM
                ARM Marketing, BS up to my earsDavid Kanter2015/02/04 10:51 AM
                  ARM Marketing, BS up to my earsMaynard Handley2015/02/04 01:59 PM
                    ARM Marketing, BS up to my earsDavid Kanter2015/02/04 02:21 PM
                  ARM Marketing, BS up to my earsGroo2015/02/04 02:30 PM
          ARM announces A72juanrga2015/02/04 04:23 AM
            ARM announces A72Wilco2015/02/04 03:01 PM
              ARM announces A72juanrga2015/02/04 04:06 PM
        ARM announces A72Anon2015/02/04 01:28 AM
          ARM announces A72juanrga2015/02/04 04:31 AM
            ARM announces A72Aaron Spink2015/02/04 06:49 AM
      ARM announces A72Ronald Maas2015/02/03 07:23 PM
        ARM announces A72Seni2015/02/04 12:19 AM
          ARM announces A72Maynard Handley2015/02/04 10:42 AM
            ARM announces A72Seni2015/02/04 12:33 PM
              ARM announces A72dmcq2015/02/04 12:57 PM
            ARM announces A72Ronald Maas2015/02/04 06:42 PM
        ARM announces A72anon2015/02/04 05:19 AM
          ARM announces A72Exophase2015/02/04 07:31 AM
            ARM announces A72David Kanter2015/02/04 10:25 AM
              ARM announces A72Exophase2015/02/04 01:33 PM
                ARM announces A72anon2015/02/04 10:27 PM
                  ARM announces A72 (fixed format)anon2015/02/04 10:29 PM
                  ARM announces A72Exophase2015/02/04 11:11 PM
                    ARM announces A72anon2015/02/05 12:02 AM
            ARM announces A72anon2015/02/04 05:57 PM
  ARM announces A72Wilco2015/02/03 01:39 PM
    ARM announces A72Maynard Handley2015/02/03 02:13 PM
      ARM announces A72anon2015/02/03 02:29 PM
      ARM announces A72Wilco2015/02/03 02:44 PM
    ARM announces A72David Kanter2015/02/04 09:56 AM
      ARM announces A72Peter Greenhalgh2015/02/04 10:56 AM
        ARM announces A72Aaron Spink2015/02/04 11:59 AM
          ARM announces A72Alberto2015/02/07 10:22 AM
            ARM announces A72Exophase2015/02/07 10:47 AM
              ARM announces A72Alberto2015/02/07 12:44 PM
                ARM announces A72Exophase2015/02/07 02:35 PM
                  ARM announces A72Alberto2015/02/08 01:09 AM
                    ARM announces A72Exophase2015/02/08 11:05 AM
              ARM announces A72David Kanter2015/02/08 12:39 AM
                ARM announces A72dmcq2015/02/08 04:14 AM
                  ARM announces A72Michael S2015/02/08 04:38 AM
                    ARM announces A72Gabriele Svelto2015/02/10 05:11 AM
                      ARM announces A72Jouni Osmala2015/02/10 11:24 AM
                        slit vs unifiedMichael S2015/02/10 01:57 PM
                          slit vs unifieddmcq2015/02/11 05:44 AM
                  ARM announces A72Doug S2015/02/08 09:00 AM
                ARM announces A72Exophase2015/02/08 10:57 AM
        ARM announces A72dmcq2015/02/04 01:10 PM
        ARM announces A72David Kanter2015/02/04 02:28 PM
      ARM announces A72Wilco2015/02/04 01:59 PM
        ARM announces A72Aaron Spink2015/02/04 09:31 PM
        Intel 32nm vs 14 nmMichael S2015/02/05 01:03 AM
          Intel 32nm vs 14 nmWilco2015/02/05 02:27 AM
            Intel 32nm vs 14 nmDavid Kanter2015/02/05 09:05 AM
              Intel 32nm vs 14 nmcarop2015/02/05 11:12 AM
                Normalize to drawn or effective width?David Kanter2015/02/05 11:45 AM
                  Normalize to drawn or effective width?carop2015/02/05 02:40 PM
                    Normalize to drawn or effective width?David Kanter2015/02/06 12:44 PM
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