Neat die area comparison image

By: Doug S (foo.delete@this.bar.bar), October 26, 2016 8:17 am
Room: Moderated Discussions
Gabriele Svelto (gabriele.svelto.delete@this.gmail.com) on October 26, 2016 2:23 am wrote:
> David Hess (davidwhess.delete@this.gmail.com) on October 25, 2016 9:59 pm wrote:
> > The alternative is that Apple designed a 4 GHz processor
> > but only operates it at 2 GHz do to power constraints.
> > They could do that but a dedicated 2 GHz design would be higher performance or lower power or both.
>
> It would also be simpler to design. Targeting ~4GHz right from the start means that your
> timing constraints are very tight and your critical paths significantly shorter.
>
> Now, considering that Apple does not bin its CPUs we might assume that they have some
> headroom so that lower quality dies can still achieve their desired clock-speed; they
> might actually be targeting something above 2.35GHz but probably not by much.


The A9 also required headroom for the higher clock speed A9X. Granted that's a separate die, but it is hard to imagine they did a complete re-layout with different FO4 targets in the A9X's cores (which would presumably show up in benchmarking somewhere as slightly different latencies for an instruction or two) so the A9 had to be capable of being clocked to the A9X rate (plus headroom) which suggests it was designed for something closer to 3 GHz.

If rumors are true that the iPad refresh is next spring to allow using a 10nm A10X, then they wouldn't need that extra iPad headroom in the A10, but it is clocked faster than A9X despite being on essentially the same process so probably had a similar target.

But what is Intel's target? Just because their highest bin is 4 GHz doesn't mean that's their target. They need headroom above their max turbo frequency as well, and air-based overclocking results suggest their FO4 target is closer to 5 GHz.
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TopicPosted ByDate
Neat die area comparison imageRob2016/10/21 05:39 PM
  Neat die area comparison imageanonymou52016/10/21 06:44 PM
    Neat die area comparison imageMr. Camel2016/10/22 04:58 AM
      Neat die area comparison imageHeikki Kultala2016/10/22 05:19 AM
        Neat die area comparison imageMr. Camel2016/10/22 07:10 AM
          Neat die area comparison imageMr. Camel2016/10/22 07:15 AM
          different caches...Heikki Kultala2016/10/22 08:29 AM
            Broadwell includes LLC, just for comparisionanon2016/10/22 08:52 AM
              Broadwell includes LLC, just for comparisionjuanrga2016/10/23 06:09 AM
                Broadwell includes LLC, just for comparisionanon2016/10/23 07:25 AM
                  Broadwell includes LLC, just for comparisionjuanrga2016/10/25 09:57 AM
                    Broadwell includes LLC, just for comparisionSimon Farnsworth2016/10/25 11:03 AM
                      Broadwell includes LLC, just for comparisionjuanrga2016/10/28 02:02 AM
                        Broadwell includes LLC, just for comparisionanon2016/10/28 04:13 AM
                          Broadwell includes LLC, just for comparisionjuanrga2016/10/29 09:47 PM
                            Broadwell includes LLC, just for comparisionTravis2016/10/30 06:34 PM
                              Broadwell includes LLC, just for comparisionjuanrga2016/10/31 04:35 AM
                                Broadwell includes LLC, just for comparisionSimon Farnsworth2016/10/31 04:42 AM
                                Broadwell includes LLC, just for comparisionanon2016/11/01 12:56 PM
                                  Broadwell includes LLC, just for comparisionMaynard Handley2016/11/01 01:37 PM
                                    Broadwell includes LLC, just for comparisionanon2016/11/01 04:22 PM
                                      Broadwell includes LLC, just for comparisionMaynard Handley2016/11/01 07:30 PM
                                        Broadwell includes LLC, just for comparisionanon2016/11/02 06:15 AM
                                          Broadwell includes LLC, just for comparisionMaynard Handley2016/11/02 09:23 AM
                                            Broadwell includes LLC, just for comparisionanon2016/11/02 11:50 AM
                                  Broadwell includes LLC, just for comparisionSimon Farnsworth2016/11/02 02:48 AM
                        Broadwell includes LLC, just for comparisionSimon Farnsworth2016/10/28 06:19 AM
                          Broadwell includes LLC, just for comparisionjuanrga2016/10/29 10:15 PM
                            Broadwell includes LLC, just for comparisionSimon Farnsworth2016/10/30 12:31 PM
                        Broadwell includes LLC, just for comparisionRicardo B2016/10/29 05:30 PM
                    underclocked is different than designed for low clock speedHeikki Kultala2016/10/25 11:47 PM
                      underclocked is different than designed for low clock speedMaynard Handley2016/10/26 10:07 AM
                      That wasn't the pointjuanrga2016/10/28 02:15 AM
                        Even without the point you have invalid comparisonHeikki Kultala2016/10/28 09:03 AM
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                            8 wide vs 6 wideWilco2016/10/30 05:00 AM
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                                8 wide vs 6 widejuanrga2016/10/30 02:56 PM
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                                      8 wide vs 6 wideanon2016/11/01 01:00 PM
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                                                      8 wide vs 6 wideWilco2016/11/07 04:25 AM
                                              8 wide vs 6 wideAaron Spink2016/11/04 04:08 PM
                                                8 wide vs 6 widejuanrga2016/11/04 06:10 PM
                                            Dunning-Krueger effectHeikki Kultala2016/11/04 03:22 AM
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                                          8 wide vs 6 wideanon2016/11/04 03:38 AM
                                            8 wide vs 6 widejuanrga2016/11/04 05:05 AM
                                              8 wide vs 6 wideanon2016/11/04 06:12 AM
                                                8 wide vs 6 wideWilco2016/11/04 01:12 PM
                                                  8 wide vs 6 wideanon2016/11/04 02:54 PM
                                                    8 wide vs 6 widejuanrga2016/11/04 05:34 PM
                                                      8 wide vs 6 wideanon2016/11/05 02:14 AM
                                                  8 wide vs 6 widejuanrga2016/11/04 05:39 PM
                                                    8 wide vs 6 wideWilco2016/11/06 05:15 AM
                                                      8 wide vs 6 widejuanrga2016/11/06 05:06 PM
                                                        8 wide vs 6 wideWilco2016/11/07 03:45 AM
                                                          8 wide vs 6 wideDavid Kanter2016/11/07 08:43 PM
                                                            8 wide vs 6 wideWilco2016/11/08 03:57 AM
                                                          8 wide vs 6 widejuanrga2016/11/14 12:12 PM
                                                            8 wide vs 6 wideWilco2016/11/14 04:53 PM
                                                              8 wide vs 6 widedmcq2016/11/15 03:17 AM
                                                                8 wide vs 6 wideWilco2016/11/15 03:43 AM
                                                                  8 wide vs 6 widedmcq2016/11/15 04:28 AM
                                                                  1 µop per instruction is not necessaryPaul A. Clayton2016/11/17 12:09 PM
                                                              8 wide vs 6 widejuanrga2016/11/20 06:56 AM
                                                                8 wide vs 6 wideWilco2016/11/21 05:54 PM
                                                                  8 wide vs 6 widejuanrga2016/11/22 08:49 AM
                                                                    8 wide vs 6 wideWilco2016/11/22 03:25 PM
                                  8 wide vs 6 wideWilco2016/10/31 03:03 AM
                              Skylake can retire 8 uopsDavid Kanter2016/10/31 12:41 AM
                                Skylake can retire 8 uopsjuanrga2016/10/31 04:15 AM
                                  Skylake can retire 8 uopsAlberto2016/11/04 07:22 AM
                            8 wide vs 6 wide bogus numbersHeikki Kultala2016/10/30 06:25 AM
                    Broadwell includes LLC, just for comparisionanon2016/10/26 03:10 AM
                      Pushing the hidden agendajuanrga2016/10/28 03:11 AM
                        Pushing the hidden agendaanon2016/10/28 04:35 AM
      Neat die area comparison imageDavid Hess2016/10/22 01:26 PM
        Neat die area comparison imageanon22016/10/22 05:20 PM
          Neat die area comparison imageDavid Hess2016/10/22 10:31 PM
            Neat die area comparison imageanon22016/10/23 01:50 AM
        Neat die area comparison imageTravis2016/10/24 01:26 PM
          Neat die area comparison imageMaynard Handley2016/10/24 04:27 PM
            Neat die area comparison imagejuanrga2016/10/25 10:02 AM
            Neat die area comparison imageDavid Hess2016/10/25 09:59 PM
              Neat die area comparison imageTravis2016/10/25 10:22 PM
                Neat die area comparison imageDavid Hess2016/10/25 10:37 PM
                  Neat die area comparison imageTravis2016/10/30 06:09 PM
              Neat die area comparison imageGabriele Svelto2016/10/26 02:23 AM
                Neat die area comparison imageDoug S2016/10/26 08:17 AM
                  Neat die area comparison imageJukka Larja2016/10/27 09:28 AM
              Neat die area comparison imageanon2016/10/26 03:32 AM
      Neat die area comparison imagejuanrga2016/10/23 06:29 AM
    Neat die area comparison imageMatthias Waldhauer2016/10/22 06:12 AM
  Neat die area comparison imagejuanrga2016/10/23 05:44 AM
  Neat die area comparison imageGabriele Svelto2016/10/24 02:17 AM
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