Cortex-A72 Technical Reference Manual

By: Wilco (Wilco.Dijkstra.delete@this.ntlworld.com), March 6, 2015 11:49 am
Room: Moderated Discussions
Alberto (git.delete@this.git.it) on March 6, 2015 10:45 am wrote:
> Exophase (exophase.delete@this.gmail.com) on March 5, 2015 12:57 pm wrote:
> > Alberto (git.delete@this.git.it) on March 5, 2015 11:06 am wrote:
> > > Do you expected much from ARM?? This is only a minor refresh
> > > useful in handset, a larger L2 could give better
> > > responsiveness, less bus activity and some advantage on few bench suites so loved by tech sites.
> > > So nearly all the advantage is in the new process and in a better power management, no breaking news.
> > >
> > > Qualcomm sports this core right now in the 600 serie, this say a lot about
> > > the strategic utility of the custom core that we'll see in 820.
> > >
> > >
> >
> > You're making the mistake of thinking that they only changed those two things because
> > that's all that's demonstrated in the TRM. ARM's TRMs today are very light on uarch details.
> > While it does rule out some improvements there are many others that it does not.
>
> Sure you are right, still i don't think this is a "fast" cpu, in 620 is clocked at 1.8
> Ghz and the flagship is 810 with a 2Ghz A57, i am pretty certain there is no trivial difference
> between 620 and 810 for market differentiation. Strange enough apparently it looks "slower"
> clock to clock than A57 to drop the power.

It's obvious the 620 will outperform the 810 despite running at a lower frequency. QC just clocks it slow enough to avoid making their next-gen custom core look bad...

MediaTek has no such positioning issues and announced 2.4GHz A72's that will beat Apple A8 and Denver by a good margin.

> A57 is a power hog by default.

Sure, that's why Samsung puts quad-core 2.1GHz A57 in their phones rather than Krait. They obviously selected the worst power hog they could possibly find and then made the battery a lot smaller too because as we all know, as long as the frame is metallic, battery life doesn't matter.

Wilco
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Cortex-A72 Technical Reference ManualRonald Maas2015/03/05 07:01 AM
  Cortex-A72 Technical Reference Manualdmcq2015/03/05 10:01 AM
  Cortex-A72 Technical Reference ManualAlberto2015/03/05 10:06 AM
    Cortex-A72 Technical Reference ManualExophase2015/03/05 11:57 AM
      Cortex-A72 Technical Reference ManualAlberto2015/03/06 09:45 AM
        Cortex-A72 Technical Reference ManualWilco2015/03/06 11:49 AM
          Cortex-A72 Technical Reference ManualAlberto2015/03/06 01:09 PM
            Cortex-A72 Technical Reference ManualWilco2015/03/07 08:37 AM
          Cortex-A72 Technical Reference Manualjuanrga2015/03/06 05:18 PM
    Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/05 02:40 PM
      Cortex-A72 Technical Reference ManualWilco2015/03/05 03:28 PM
        Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/05 11:32 PM
        Cortex-A72 Technical Reference ManualDavid Kanter2015/03/05 11:42 PM
          Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/06 01:55 AM
            Cortex-A72 Technical Reference Manualnone2015/03/06 02:36 AM
              Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/06 03:08 AM
                Cortex-A72 Technical Reference Manualnone2015/03/06 03:12 AM
                Cortex-A72 Technical Reference ManualWilco2015/03/06 03:39 AM
          Cortex-A72 Technical Reference ManualWilco2015/03/06 04:04 AM
            Cortex-A72 Technical Reference Manualnone2015/03/06 04:50 AM
              Cortex-A72 Technical Reference ManualWilco2015/03/07 08:26 AM
                Cortex-A72 Technical Reference Manualnone2015/03/09 12:10 AM
                  Cortex-A72 Technical Reference Manualdmcq2015/03/09 01:14 AM
                    Cortex-A72 Technical Reference Manualnone2015/03/09 01:53 AM
          Cortex-A72 Technical Reference ManualBrett2015/03/06 11:57 AM
            Cortex-A72 Technical Reference ManualKlimax2015/03/06 12:39 PM
            Cortex-A72 Technical Reference ManualExophase2015/03/06 01:22 PM
            Cortex-A72 Technical Reference ManualWilco2015/03/06 01:31 PM
              Cortex-A72 Technical Reference Manualjuanrga2015/03/06 05:22 PM
                Broadcom VulcanBrett2015/03/07 01:56 PM
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                        Broadcom VulcanMichael S2015/03/08 01:30 AM
                          Broadcom VulcanGabriele Svelto2015/03/08 03:55 AM
                    Broadcom VulcanHugo Décharnes2015/03/08 12:47 AM
                      Broadcom VulcanExophase2015/03/08 10:58 AM
                  Broadcom Vulcanjuanrga2015/03/07 06:06 PM
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                    Broadcom VulcanGabriele Svelto2015/03/08 03:57 AM
                    Broadcom Vulcanjuanrga2015/03/08 06:12 AM
              Cortex-A72 Technical Reference ManualDavid Kanter2015/03/06 11:43 PM
                Cortex-A72 Technical Reference Manualjuanrga2015/03/07 05:16 AM
                Cortex-A72 Technical Reference ManualWilco2015/03/07 08:50 AM
                  Cortex-A72 Technical Reference ManualDavid Kanter2015/03/08 01:30 AM
                    Cortex-A72 Technical Reference ManualMichael S2015/03/08 03:14 AM
                    Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/08 03:26 AM
                      Cortex-A72 Technical Reference Manualjuanrga2015/03/08 05:51 AM
                        Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/08 06:08 AM
                    Cortex-A72 Technical Reference ManualKlimax2015/03/08 07:44 AM
                  Cortex-A72 Technical Reference ManualGabriele Svelto2015/03/08 03:01 AM
              Cortex-A72 Technical Reference Manualanon2015/03/07 10:41 AM
            Cortex-A72 Technical Reference ManualDavid Kanter2015/03/06 11:37 PM
              Cortex-A72 Technical Reference ManualExophase2015/03/06 11:45 PM
              Cortex-A72 Technical Reference ManualJouni Osmala2015/03/07 01:54 AM
              Cortex-A72 Technical Reference Manualhashhash2015/03/07 06:06 AM
      Cortex-A72 Technical Reference Manualnone2015/03/05 11:36 PM
        Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/06 01:47 AM
          Cortex-A72 Technical Reference Manualnone2015/03/06 02:29 AM
            Cortex-A72 Technical Reference ManualHugo Décharnes2015/03/06 03:02 AM
        Cortex-A72 Technical Reference Manualjuanrga2015/03/06 08:38 AM
          Cortex-A72 Technical Reference ManualJouni Osmala2015/03/06 09:27 AM
      Cortex-A72 Technical Reference ManualAlberto2015/03/06 09:58 AM
        Cortex-A72 Technical Reference ManualExophase2015/03/06 10:52 AM
          Cortex-A72 Technical Reference ManualAlberto2015/03/06 02:30 PM
            Cortex-A72 Technical Reference Manualjuanrga2015/03/06 05:32 PM
            Cortex-A72 Technical Reference ManualRonald Maas2015/03/06 07:11 PM
              Cortex-A72 Technical Reference ManualAlberto2015/03/07 05:52 AM
                Cortex-A72 Technical Reference ManualRonald Maas2015/03/07 08:52 AM
  Cortex-A72 Technical Reference ManualNoSpammer2015/03/05 11:33 AM
  Add two more differences.Jouni Osmala2015/03/05 02:13 PM
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