New Silicon Insider Article

Article: Sizing up the Super Heavyweights
By: Paul DeMone (, October 17, 2004 6:58 am
Room: Moderated Discussions
Anonymous4 (i@am.anonymous) on 10/16/04 wrote:
>David Kanter ( on 10/11/04 wrote:
>>Paul DeMone has just finished his latest edition of Silicon Insider.
>Paul, great read, two questions:
>1) Why do you show 3 separate blocks of L2 cache per die on
>figure 5. ? Is that an accurate physical or logical
>representation of the power4/5 die? I was under the
>impression that the L2 was shared between the cores. I
>apologize in advance if I've missed something
>elementary, I'm not an MPU architect (IANAMA).

It is but in most MPUs the L2 is a single logical entity. In
the POWER4/POWER5 it consists of three separate pools
of memory each with its own separate controller. Cache
lines are hashed across the three controllers/arrays.

>2) Your estimate of 2.7 Ghz for Power5+ is interesting. Do
>you think that will be the initial maximum or an eventual
>maximum? I'm thinking you mean the final maximum.

POWER5+ will likely be introduced at 2 or 3 clock rates
to hit different price/performance points. The highest of
those clock rates will be around 2.7 GHz IMO although
the availability of those models may be slightly delayed.

>If Power5+ never makes it to 2.7 Ghz, how will that
>affect the eventual performance race between it and
>Montecito ? I would assume it could have a great impact
>judging by the numbers in table4, where the estimates
>show Power5+ achieving near linear scaling in the SPEC
>workloads and Linpack with very respectable scaling in
>TPC/C. Plus, the estimates between it and Montecito look
>very close.

I don't think it will matter much beyond bragging rights
for specific closely fought benchmarks. IMO both POWER5+
and Montecito will be so far ahead of everything else in
the high end server market that a moderate shortfall in the
POWER5+ clock rate will not affect market dynamics very
much. In this segment small differences in performance
have little impact compared to other often less quantifiable
factors that come into play.
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TopicPosted ByDate
New Silicon Insider ArticleDavid Kanter2004/10/11 05:43 AM
  Good read. Thanks again Paul. (NT)Michael Menietti2004/10/11 06:36 AM
  New Silicon Insider ArticleSingh, S.R.2004/10/11 06:44 AM
    New Silicon Insider ArticlePaul DeMone2004/10/11 06:55 AM
  New Silicon Insider Articletecate2004/10/11 09:52 AM
  core size: x86 vs IPFanonymous2004/10/11 11:43 AM
    Good Question. (NT)Chuck2004/10/12 08:22 AM
    core size: x86 vs IPFMichael S2004/10/12 10:53 AM
    K8 core size 52mm^2IlleglWpns2004/10/12 12:15 PM
    core size: x86 vs IPFPaul DeMone2004/10/12 01:10 PM
  New Silicon Insider ArticleJS2004/10/13 02:42 AM
  New Silicon Insider Articlemas2004/10/16 09:07 AM
  New Silicon Insider ArticleAnonymous42004/10/16 10:39 PM
    New Silicon Insider ArticlePaul DeMone2004/10/17 06:58 AM
  New Silicon Insider ArticleArun Ramakrishnan2004/10/22 08:48 AM
    New Silicon Insider ArticlePaul DeMone2004/10/22 10:38 AM
      New Silicon Insider ArticleDavid Kanter2004/10/22 11:04 PM
        New Silicon Insider ArticlePaul DeMone2004/10/23 06:02 AM
        New Silicon Insider ArticleArun Ramakrishnan2004/10/23 01:47 PM
      New Silicon Insider ArticleMichael S2004/10/23 11:38 AM
        New Silicon Insider ArticlePaul DeMone2004/10/23 01:10 PM
          New Silicon Insider ArticleMichael S2004/10/23 01:40 PM
  Do I see a flaw here?IntelUser20002004/10/27 05:43 PM
    Frequency is different for startersPaul DeMone2004/10/27 06:05 PM
      Frequency is different for startersIntelUser2004/10/27 06:28 PM
        Frequency is different for startersPaul DeMone2004/10/27 07:49 PM
          Frequency is different for startersIntelUser20002004/10/27 08:45 PM
  New Silicon Insider ArticleIntelUser20002004/11/01 10:13 AM
    New Silicon Insider Articleanonymous2004/11/02 09:46 AM
      New Silicon Insider ArticleChuck2004/11/02 10:33 AM
        New Silicon Insider ArticleSingh, S.R.2004/11/02 12:21 PM
          New Silicon Insider ArticleJosé Javier Zarate2004/11/02 03:14 PM
            New Silicon Insider ArticleSingh, S.R.2004/11/02 07:47 PM
        New Silicon Insider Articleanonymous2004/11/03 03:04 PM
          New Silicon Insider Articleanonymous2004/11/03 03:07 PM
  New Silicon Insider ArticleIntelUser20002004/11/04 11:30 AM
    New Silicon Insider ArticleIntelUser20002004/11/04 09:38 PM
      New Silicon Insider ArticleDavid Kanter2004/11/05 08:44 AM
        New Silicon Insider ArticleIntelUser20002004/11/08 08:23 PM
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