NVIDIA'S FIRST CPU IS A WINNER (Linley Gwennap)

By: juanrga (nospam.delete@this.juanrga.com), January 10, 2015 3:34 pm
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on January 8, 2015 6:37 pm wrote:
> juanrga (nospam.delete@this.juanrga.com) on January 7, 2015 6:03 am wrote:
> > I recall Aaron asking me why I believed that mixing VLIW with
> > RA was a good idea. Funny, because we know now that
> > Denver is an in-order VLIW+RA core that outperforms wide OoO cores such as Cyclone or Haswell.
>
> Have you not noticed that nVidia did not select the fastest 15W Haswell CPU they could?
>
> The 2955U Celeron is a 15W TDP part with no hyperthreading, a clockspeed
> of 1.4 GHz and 2 MB of L3 cache. Turbo-boost is disabled.
>
> The 4650U is *also* a 15W TDP Haswell part, but it has a base frequency
> of 1.7 GHz, 4 MB of L3 cache and will turbo to 3.3 GHz.

I am not inside their heads, but I guess that one being a $132 chip whereas the other being a $454 chip played some role.

Have care with turbo frequencies. In Anand review the 4650U had difficulties achieving the 3.3GHz on ST and in MT Anand saw "occasional bursts up to 2.9GHz".

http://www.anandtech.com/show/7113/2013-macbook-air-core-i5-4250u-vs-core-i7-4650u/3

> Eyeballing the nVidia chart, the Denver (@ 2.5GHz?) beat the 2955U by about 10% on SpecInt2000. My guess is
> that a 4650U would beat the Denver chip by close to 2:1. When you lose by 2:1, you aren't "outperforming".

Denver beats it at much less than half the power consumption, die area, and price.

E.g. a single Haswell core on 22nm occupies more die space than two Denver cores on 28nm.

All that is a win in my book.

> If you want to do a technical comparison between Denver and Haswell, you really
> do have to pick the fastest relevant Haswell part, not the slowest.
>

If I was to do a technical comparison I would avoid Haswell because cannot produce the required level of performance with same power consumption and die space constraints that Denver engineers had to satisfy. I would chose an Atom chip and normalize for the node advantage (22FF vs 28PL). The result would be about the same.
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ARMv8 getting atomic operationsdmcq2014/12/02 04:32 PM
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      ARMv8 getting atomic operationsdmcq2014/12/03 02:16 AM
      ARMv8 getting atomic operationsMaynard Handley2014/12/03 08:20 AM
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      ARMv8 getting atomic operationsLinus Torvalds2014/12/03 10:15 AM
        ARMv8 getting atomic operationsanon2014/12/03 04:08 PM
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                Avoiding ping ponganon2014/12/04 09:15 AM
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                Avoiding ping pongAaron Spink2014/12/04 11:01 AM
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                    Avoiding ping pongGabriele Svelto2014/12/04 01:49 PM
                      Avoiding ping pongKonrad Schwarz2014/12/04 10:08 PM
                        Avoiding ping pongGabriele Svelto2014/12/04 11:04 PM
                          Avoiding ping pongEric Bron nli2014/12/05 01:28 AM
                            Avoiding ping pongKonrad Schwarz2014/12/05 02:37 AM
                              Avoiding ping pongEric Bron nli2014/12/05 03:23 AM
                                Avoiding ping pongKlimax2014/12/05 04:47 AM
                                  Avoiding ping pongEric Bron2014/12/05 05:24 AM
                              Avoiding ping pongGabriele Svelto2014/12/05 09:38 AM
                                Avoiding ping pongKonrad Schwarz2014/12/07 01:28 PM
                                  Avoiding ping pongGabriele Svelto2014/12/08 06:10 PM
                                    Avoiding ping pongKonrad Schwarz2014/12/09 04:12 AM
                                      Avoiding ping pongGabriele Svelto2014/12/09 06:31 AM
                                        Avoiding ping ponganon2014/12/09 10:24 PM
                            Avoiding ping pongGabriele Svelto2014/12/05 09:17 AM
                              Avoiding ping pongEric Bron2014/12/05 09:32 AM
                                Avoiding ping pongGabriele Svelto2014/12/05 11:45 AM
                                  Avoiding ping pongEric Bron2014/12/06 01:20 AM
                                    Avoiding ping pongnksingh2014/12/06 02:42 AM
                                      Avoiding ping pongEric Bron2014/12/06 03:04 AM
                                        Avoiding ping pongGiGNiC2014/12/06 05:27 AM
                                          Avoiding ping pongEric Bron nli2014/12/06 05:44 AM
                                          Avoiding ping pongEric Bron2014/12/06 06:07 AM
                                            Avoiding ping pongnksingh2014/12/07 03:06 PM
                                              Avoiding ping pongEric Bron2014/12/08 03:17 AM
                                                Avoiding ping pongGiGNiC2014/12/08 10:53 AM
                                                Avoiding ping pongnksingh2014/12/08 04:53 PM
                                                  Avoiding ping pongEric Bron2014/12/09 12:33 AM
                                    Avoiding ping pongdmsc2014/12/06 03:12 AM
                                      Avoiding ping pongEric Bron2014/12/06 03:25 AM
                                        Avoiding ping pongKlimax2014/12/06 04:49 AM
                                          Avoiding ping pongrwessel2014/12/07 01:34 AM
                                        Avoiding ping pongdmsc2014/12/06 06:39 AM
                                        Avoiding ping pongKonrad Schwarz2014/12/07 01:37 PM
                                          Avoiding ping pongMichael S2014/12/07 03:37 PM
                                            Avoiding ping pongKonrad Schwarz2014/12/08 03:35 AM
                          Avoiding ping pongKonrad Schwarz2014/12/05 02:30 AM
                        Avoiding ping pongLinus Torvalds2014/12/05 11:58 AM
                          Avoiding ping pongEric Bron2014/12/06 01:42 AM
                            Avoiding ping pongnksingh2014/12/06 02:51 AM
                              Avoiding ping pongEric Bron2014/12/06 03:08 AM
                            Avoiding ping pongLinus Torvalds2014/12/06 12:25 PM
                              Avoiding ping pongnksingh2014/12/07 02:26 PM
                                Avoiding ping pongEric Bron2014/12/08 03:35 AM
                                  Avoiding ping pongBrett2014/12/08 09:00 AM
                                    Avoiding ping pongEric Bron2014/12/08 09:48 AM
                                    Avoiding ping pongrwessel2014/12/08 11:52 AM
                                      Avoiding ping pongBrett2014/12/08 12:58 PM
                                      Avoiding ping pongDoug S2014/12/08 01:04 PM
                              Avoiding ping pongJouni Osmala2014/12/08 01:45 AM
                                Avoiding ping ponganon2014/12/08 04:44 AM
                                  Avoiding ping pongJouni Osmala2014/12/08 12:10 PM
                                    Avoiding ping pongLinus Torvalds2014/12/08 12:34 PM
                                      Avoiding ping pongJouni Osmala2014/12/08 02:47 PM
                                        Avoiding ping pongLinus Torvalds2014/12/08 07:08 PM
                                          Avoiding ping pongGabriele Svelto2014/12/09 06:48 AM
                                            Avoiding ping pongMaynard Handley2014/12/09 10:41 AM
                                              Avoiding ping pongPatrick Chase2014/12/09 12:06 PM
                                              Avoiding ping pongGabriele Svelto2014/12/09 12:52 PM
                                                Avoiding ping pongPatrick Chase2014/12/09 01:08 PM
                                            Why read RWT or Reddit when you can get journalists to do it for you?Rob Thorpe2015/01/02 07:20 AM
                                              Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/02 10:21 AM
                                                Why read RWT or Reddit when you can get journalists to do it for you?EduardoS2015/01/02 10:37 AM
                                                  Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/03 11:00 AM
                                                Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron nli2015/01/02 01:28 PM
                                                  Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/03 11:02 AM
                                                    Why read RWT or Reddit when you can get journalists to do it for you?Michael S2015/01/03 11:36 AM
                                                      Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/03 12:11 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Michael S2015/01/03 12:30 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/03 01:57 PM
                                                            KNL cacheDavid Kanter2015/01/03 06:36 PM
                                                              KNL cacheEric Bron2015/01/04 02:34 AM
                                                                KNL cacheMichael S2015/01/04 03:11 AM
                                                                  KNL cacheEric Bron2015/01/04 03:57 AM
                                                                    KNL cacheMichael S2015/01/04 04:21 AM
                                                                      KNL cacheEric Bron2015/01/04 04:58 AM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/07 04:47 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Michael S2015/01/07 07:27 AM
                                                              Manycores vs multicoresjuanrga2015/01/10 03:10 PM
                                                                Manycores vs multicoresAaron Spink2015/01/10 04:32 PM
                                                                  Manycores vs multicoresjuanrga2015/01/10 05:32 PM
                                                                    Manycores vs multicoresExophase2015/01/10 05:49 PM
                                                                      Manycores vs multicoresjuanrga2015/01/10 07:21 PM
                                                                        Manycores vs multicoresExophase2015/01/10 07:51 PM
                                                                        Manycores vs multicoresAaron Spink2015/01/10 08:03 PM
                                                                    Manycores vs multicoresAaron Spink2015/01/10 06:21 PM
                                                                      Manycores vs multicoresjuanrga2015/01/10 07:25 PM
                                                                        Manycores vs multicoresAaron Spink2015/01/10 08:11 PM
                                                                          Manycores vs multicoresJouni Osmala2015/01/11 03:50 AM
                                                                            Manycores vs multicoresjuanrga2015/01/11 07:58 AM
                                                                            Manycores vs multicorescoppice2015/01/12 09:01 PM
                                                                              Manycores vs multicoresJouni Osmala2015/01/13 03:38 AM
                                                                        Manycores vs multicoresanon2015/01/11 02:19 AM
                                                                      Manycores vs multicoresMichael S2015/01/11 04:44 AM
                                                                        Manycores vs multicoresAaron Spink2015/01/11 04:55 PM
                                                                          Manycores vs multicoresMichael S2015/01/12 03:41 AM
                                                                            Manycores vs multicoresEric Bron2015/01/12 05:29 AM
                                                                              Manycores vs multicoresEric Bron2015/01/12 05:30 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/03 01:54 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/07 04:48 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/07 06:41 AM
                                                              Manycores vs multicoresjuanrga2015/01/10 03:14 PM
                                                    Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/03 01:42 PM
                                                      Why read RWT or Reddit when you can get journalists to do it for you?juanrga2015/01/07 05:03 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/07 06:45 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Linus Torvalds2015/01/08 02:09 PM
                                                          Pink unicorns for salejuanrga2015/01/10 04:09 PM
                                                        Intentionally picking a competitors slow part is cheating ...Mark Roulo2015/01/08 05:37 PM
                                                          Intentionally picking a competitors slow part is cheating ...coppice2015/01/08 10:38 PM
                                                            Intentionally picking a competitors slow part is cheating ...Mark Roulo2015/01/09 08:13 AM
                                                              Intentionally picking a competitors slow part is cheating ...Anon2015/01/10 01:00 AM
                                                              Intentionally picking a competitors slow part is cheating ...David Hess2015/01/11 12:03 PM
                                                            Intentionally picking a competitors slow part is cheating ...someone2015/01/09 09:31 AM
                                                              Intentionally picking a competitors slow part is cheating ...coppice2015/01/12 08:45 PM
                                                                Intentionally picking a competitors slow part is cheating ...coppice2015/01/12 08:47 PM
                                                                  Intentionally picking a competitors slow part is cheating ...Michael S2015/01/13 06:53 AM
                                                                    Intentionally picking a competitors slow part is cheating ...coppice2015/01/13 08:44 AM
                                                                      Intentionally picking a competitors slow part is cheating ...Michael S2015/01/13 09:01 AM
                                                                        Intentionally picking a competitors slow part is cheating ...coppice2015/01/13 07:35 PM
                                                                      Core sizesjuanrga2015/01/13 11:28 AM
                                                          NVIDIA'S FIRST CPU IS A WINNER (Linley Gwennap)juanrga2015/01/10 03:34 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase2015/01/08 06:02 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?coppice2015/01/08 09:18 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase2015/01/09 10:54 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Mark Roulo2015/01/09 11:59 AM
                                                              Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase2015/01/09 02:20 PM
                                                                Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron2015/01/09 02:30 PM
                                                            Alternatives to OOOE (again)juanrga2015/01/10 03:50 PM
                                                              Alternatives to OOOE (again)David Kanter2015/01/10 11:10 PM
                                                                Alternatives to OOOE (again)juanrga2015/01/11 07:30 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Gabriele Svelto2015/01/10 11:53 PM
                                              Why read RWT or Reddit when you can get journalists to do it for you?Fake Linus Torvalds2015/01/03 11:14 AM
                                                Why read RWT or Reddit when you can get journalists to do it for you?Rob Thorpe2015/01/03 07:25 PM
                                          Avoiding ping pongMaynard Handley2014/12/09 10:33 AM
                                            Avoiding ping pongPatrick Chase2014/12/09 12:54 PM
                                              Avoiding ping pongMaynard Handley2014/12/09 05:56 PM
                                      Avoiding ping pongSalvatore De Dominicis2014/12/09 07:51 AM
                                        Avoiding ping pongPatrick Chase2014/12/09 01:00 PM
                                      Avoiding ping pongook2014/12/11 02:31 AM
                                      Avoiding ping pongArt Scott2014/12/19 09:19 PM
                                        Avoiding ping pongEric Bron nli2014/12/20 03:05 AM
                                      What about specialization?Troll?2015/01/02 06:55 AM
                                        What about specialization?Ungo2015/01/04 02:27 PM
                                      Avoiding ping pongfewwef2015/01/05 07:16 PM
                                      Avoiding ping pongV.Krishn2015/01/08 05:11 AM
                                    Avoiding ping pongGabriele Svelto2014/12/08 06:32 PM
                                    Avoiding ping ponganon2014/12/08 10:37 PM
                            Avoiding ping pongKonrad Schwarz2014/12/10 05:23 AM
                              Avoiding ping pongLinus Torvalds2014/12/10 10:56 AM
                          Object reference lockingDavid W2014/12/08 10:36 PM
                            Object reference lockingPatrick Chase2014/12/09 03:52 PM
                              Object reference lockingDavid W2014/12/11 04:18 AM
                    ISA != interface for "most programmers"Paul A. Clayton2014/12/04 02:34 PM
                      ISA != interface for "most programmers"rwessel2014/12/04 06:50 PM
                  Interesting! (exporting hot lines/cache-aware ISA); "Please sir, I want some more" (NT)Paul A. Clayton2014/12/04 01:26 PM
                  Avoiding ping pongMichael S2014/12/06 02:48 PM
          ARMv8 getting atomic operationsLinus Torvalds2014/12/04 11:05 AM
            LL/SC idiom recognition is not admitting RMW superiorityPaul A. Clayton2014/12/04 01:34 PM
            ARMv8 getting atomic operationsanon2014/12/04 09:17 PM
    ARMv8 getting atomic operationsPatrick Chase2014/12/03 11:09 AM
  limited ordernksingh2014/12/04 09:17 PM
    I didn't understand this either. (NT)Konrad Schwarz2014/12/04 09:32 PM
    limited orderdmcq2014/12/05 01:13 AM
    limited orderbakaneko2014/12/05 08:11 AM
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