ISSCC 2007 Coverage Online

Article: ISSCC 2007: A Brief Survey
By: David W. Hess (dwhess.delete@this.banishedsouls.org), March 26, 2007 10:37 am
Room: Moderated Discussions
Anonymous1 (anon@anon.anon) on 3/26/07 wrote:
---------------------------
>Thanks for the article. Is PA Semi able to vary the voltage in different domains
>on the same chip independently? How is this different from Intel's Foxton? From
>what I understand, Foxton will require no software interaction, whereas PA Semi's chip does. Is this correct?

Intel varies the voltage and clock speed based on instantaneous (8 microseconds) power dissipation which varies depending on the current work load to remain within a specific thermal envelope:

http://www.intel.com/technology/magazine/computing/foxton-technology-0905.htm
http://www.edn.com/article/CA501674.html?partner=enews&industryid=22113

So if you are not making use of the floating point units the voltage and frequency are increased up to the thermal limit.

PA Semi is using separate clock domains and power planes for different units to minimize the power dissipation which seems like what Intel calls demand-based switching. Here each core has an independent voltage and frequency under software control much like a low power laptop processor. I understand AMD's upcoming processor does something similar.
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TopicPosted ByDate
ISSCC 2007 Coverage OnlineDavid Kanter2007/03/25 11:39 PM
  ISSCC 2007 Coverage OnlineAnonymous12007/03/26 08:16 AM
    ISSCC 2007 Coverage OnlineDavid Kanter2007/03/26 10:28 AM
    ISSCC 2007 Coverage OnlineDavid W. Hess2007/03/26 10:37 AM
      ISSCC 2007 Coverage OnlineAnonymous12007/03/26 11:01 AM
        ISSCC 2007 Coverage OnlineDavid Kanter2007/03/26 11:26 AM
          Looks like Penryn will get single-threaded frequency boostAnonymous12007/03/28 11:03 AM
            Looks like Penryn will get single-threaded frequency boostIntelUser20002007/03/28 10:47 PM
      ISSCC 2007 Coverage OnlineJosé Javier Zarate2007/03/27 04:33 AM
      ISSCC 2007 Coverage Onlineanon2007/03/27 08:57 AM
        ISSCC 2007 Coverage OnlineDavid W. Hess2007/03/27 10:08 AM
          ISSCC 2007 Coverage Onlinesavantu2007/03/27 02:37 PM
            ISSCC 2007 Coverage OnlineDavid Kanter2007/03/27 02:42 PM
        ISSCC 2007 Coverage OnlineDavid Kanter2007/03/27 11:30 AM
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