ARM announces A72

By: David Kanter (dkanter.delete@this.realworldtech.com), February 4, 2015 2:28 pm
Room: Moderated Discussions
Peter Greenhalgh (no.delete@this.thanks.com) on February 4, 2015 11:56 am wrote:
> Hi David,
>
> Hope you are doing well.
>
> I'm going to avoid being drawn in to the discussion here, though it's great to read the speculation! :)
>
> However, I will shed some more light on some of the questions & comments
> in this thread with information we announced yesterday in San Francisco.

Excellent :)

> Firstly, there are micro-architectural enhancements throughout the Cortex-A72 design which improve both
> IPC and power. In fact, the Cortex-A72 power improvements are achieved on the same process with the same
> library as Cortex-A57. We aren't relying on a process shrink to achieve the power improvement or boost
> performance purely through frequency. Depending on the workload we're seeing anywhere between 10-50%
> more clock-for-clock performance than Cortex-A57 under identical system conditions while also reducing
> power. I'm talking about a range of decent sized, representative workloads, not micro-benchmarks. More
> information on the micro-architecture and said workloads will be disclosed in due course! :)

That was very helpful and a great clarification.

I'll be very interested to see what an average case is. 10% as a lower bound is pretty impressive.

> With respect to the performance uplift numbers over Cortex-A15 and Cortex-A57 that we quoted at the
> launch. These do factor in process technology. Cortex-A15 is predominantly a 28nm product, Cortex-A57
> is mainly on 20nm and Cortex-A72 we expect to see on 14nm/16nm. While the audience here on RWT is
> very technical and understands the nuances of process geometry, many of the press we speak to want
> an appreciation of how much faster the processor in their favourite phone, tablet, may be in the
> future.
>To that end we quote performance uplift as a combination of the IPC improvement and the extra
> frequency afforded to our silicon partners due to advances in process technology.

Every time I have asked the marketing guys to give out actual IPC vs. process numbers, they dodge the question. So thanks for taking an intellectually honest approach :)

> Overall we're extremely pleased to have increased IPC while meaningfully decreasing power
> across various use cases. It's going to be great to see Cortex-A72 in partner platforms.
> As we've got more than 10 partners extremely active with the processor I hope the wait
> won't be too long! [in a big.LITTLE configuration with Cortex-A53 of course ;)]
>
> I'm going back to lurk-mode now.

Glad you could stop by : )

David
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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 Décharnes2015/02/03 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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