Nehalem review up

Article: Nehalem Performance Preview
By: Vincent Diepeveen (diep.delete@this.xs4all.nl), April 10, 2009 1:58 am
Room: Moderated Discussions
Jack (jumpingjack6@verizon.net) on 4/9/09 wrote:
---------------------------
>Vincent Diepeveen (diep@xs4all.nl) on 4/7/09 wrote:
>
>>
>>How can you draw a conclusion about Shanghai, you haven't even compared it head on with Nehalem yourself.
>>
>>Vincent
>>
>
>David did characterize, at the beginning of the article, that Shanghai would be
>fairly characterize as slightly lagging harpertown, in that it falls behind in some
>cases, achieves parity and others, and has some strong points.
>
>Considering that is roughly a good assessment, then it can be extrapolated that Nehalem has opened up a wide margin.
>
>Nonentheless, you can search the databases yourself, the 5570 DP Xeon can range
>anywhere from 1.5 to 2x faster than a Shanghai 2P (2.7 GHz). I have not found one
>where Shanghai even comes close. This does not make Shanghai a bad CPU, but it
>does make it tough for AMD to market Shanghai against Nehalem.

Sales ballony, based upon a few cracked spec tests.

Both are nearly identical processors in performance for the software we tried.

Of course HT and turboboost turned off, and Shanghai a tad higher clocked than E versions of Xeon, gives Shanghai a slight edge in clockrate 2.53Ghz vs 2.7 shanghai. Of course with more powerbudget intel clocks higher.

If you look to the intel documents in what i7 can execute it is SSE2+ instructions a cycle max. That gives 8 flops as a max, with or without HT. Is that so much higher than AMD?

Multiplication is not faster than at AMD in throughput, in fact if you try latencies of AMD are better, so a good programmer CAN be faster at AMD.

Yet these differences are that tiny, that any claim there of 50%+ is total ballony.

It's just compiler and L3 based all these claims for just a few software programs.

If you see clearly how moving from intel c++ 10.0 to 11.0 is a huge improvement at core2 already, obviously the compiler team did do a great job.

I see i7 as a very logical step from core2, yet for performance a tiny step, if you look single socket. Of course this allows intel now to scale to 2 and maybe soon 4 sockets.

>However, if you are truly interested in how Nehalem stacks up against Shanghai,
>you can search the following, scores for both processors are now in the database:

A $100 billion company, well it used to be, that just gets benchmarked for a few programs, that's not a rather good idea.

Turboboost, HT, more power budget, it sure helps to look better.

It's not a help in practice; the X series that eat so much more power, that these can increase their clockfrequency a lot more with turboboost than the E series, whereas all HPC centers will be buying nearly always the E series and some, also datacenters, already announced turboboost will get turned off. If i look at ebay now, the L series 54xx still are a lot more expensive than the E series, how comes?

>http://www.spec.org
>http://www.tpc.org
>http://www.vmware.com/products/vmmark/results.html
>
>
>Also, using a QX9770 in the comparision is not a bad idea, but it is also not a
>server branded CPU. It is irrelevant anyway, a few hundred MHz won't change the result.
>
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TopicPosted ByDate
Nehalem review upDavid Kanter2009/04/07 03:43 AM
  Nehalem review upnoone2009/04/07 06:48 AM
  Strange jbb on HarpertownHenrik S2009/04/07 08:29 AM
    Strange jbb on HarpertownDavid Kanter2009/04/07 11:19 AM
      Strange jbb on HarpertownHenrik S2009/04/07 09:33 PM
        Strange jbb on HarpertownChris2009/04/08 12:54 AM
          Strange jbb on HarpertownHenrik S2009/04/08 02:40 AM
  Nehalem review upVincent Diepeveen2009/04/07 08:34 AM
    Nehalem review upJack2009/04/09 04:51 PM
      Nehalem review upVincent Diepeveen2009/04/10 01:58 AM
        Nehalem review upMichael S2009/04/10 03:45 AM
          Nehalem review upEduardoS2009/04/10 07:01 AM
            Nehalem review upMichael S2009/04/10 07:56 AM
          Nehalem review upEugene Nalimov2009/04/10 09:12 AM
          Choice of C compiler doesn't matter much for Java...Henrik S2009/04/10 10:10 AM
            Choice of C compiler doesn't matter much for Java...EduardoS2009/04/10 02:49 PM
              Choice of C compiler doesn't matter much for Java...Henrik S2009/04/11 07:13 AM
                Choice of C compiler doesn't matter much for Java...EduardoS2009/04/11 11:30 AM
                  Large pagesDavid Kanter2009/04/11 02:02 PM
                  Choice of C compiler doesn't matter much for Java...Henrik S2009/04/11 11:06 PM
                    Choice of C compiler doesn't matter much for Java...Paul2009/04/12 01:53 AM
                      Choice of C compiler doesn't matter much for Java...iz2009/04/12 02:59 AM
                      Choice of C compiler doesn't matter much for Java...Henrik S2009/04/12 07:37 AM
                    Choice of C compiler doesn't matter much for Java...EduardoS2009/04/12 08:08 AM
                      Choice of C compiler doesn't matter much for Java...Henrik S2009/04/12 09:25 AM
                        Choice of C compiler doesn't matter much for Java...EduardoS2009/04/12 05:24 PM
                          Choice of C compiler doesn't matter much for Java...Henrik S2009/04/12 10:18 PM
                            Thread costsDavid Kanter2009/04/13 12:12 AM
                              Thread costsHenrik S2009/04/14 02:08 PM
            Choice of C compiler doesn't matter much for Java...Michael S2009/04/11 08:53 AM
              Choice of C compiler doesn't matter much for Java...Henrik S2009/04/11 11:08 PM
          Nehalem review upVincent Diepeveen2009/04/11 04:50 PM
            Nehalem review upMichael S2009/04/11 05:12 PM
              Nehalem review upVincent Diepeveen2009/04/12 03:01 AM
                Nehalem review upMichael S2009/04/12 05:07 AM
  Nehalem review uprwessel2009/04/07 02:01 PM
    Nehalem review upslacker2009/04/08 09:11 AM
      Energy vs. powerDavid Kanter2009/04/08 10:11 AM
        Energy vs. powerVincent Diepeveen2009/04/10 02:08 AM
          Energy vs. powerslacker2009/04/10 09:26 AM
            Energy vs. powerRagingDragon2009/04/10 10:19 AM
              Energy vs. powerDavid Kanter2009/04/10 11:47 AM
              Energy vs. powerJack2009/04/10 04:44 PM
                Energy vs. powerslacker2009/04/10 07:00 PM
                  Energy vs. powerJack2009/04/10 07:31 PM
                  Energy vs. powerDavid Kanter2009/04/11 12:16 AM
      Nehalem review uprwessel2009/04/08 02:32 PM
  Minor font issuegpriatko2009/04/07 04:35 PM
    Minor HTML issueDavid Kanter2009/04/07 09:38 PM
      Minor HTML issueDavid Kanter2009/04/07 09:39 PM
  Good work, i look forward to linux and SP2 numbers (NT)PiedPiper2009/04/08 01:52 AM
  Nehalem review upJoe Chang2009/04/10 03:59 AM
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