What the hell is "turbo boost"?

Discussion in 'Mac Pro' started by Ravich, Jul 27, 2010.

  1. macrumors 6502a

    Joined:
    Oct 20, 2009
    Location:
    Portland, OR
    #1
    Why have I not seen this talked about before?
     
  2. Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #2
    Intel® Turbo Boost Technology

    Intel® Turbo Boost Technology¹ is one of the many exciting features that Intel has built into latest-generation Intel® microarchitecture codename Nehalem.
    It automatically allows processor cores to run faster than the base operating frequency if it's operating below power, current, and temperature specification limits.


    via "intel turbo boost"
     
  3. macrumors 6502

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    ::1
    #3
    performance enhancer for single threaded apps.
     
  4. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
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    Finland
    #4
  5. macrumors 68020

    CaptainChunk

    Joined:
    Apr 16, 2008
    Location:
    Tempe, AZ
    #5
    TurboBoost has been around since the original Intel Nehalem-core CPUs launched.

    Basically, when the CPU detects single-threaded operation, it turns off unused cores to dynamically overclock itself for better performance.

    It's supported by Core i3, Core i5 (dual-core models) and Core i7 processors, as well as Nehalem-based Xeons.
     
  6. macrumors 603

    VirtualRain

    Joined:
    Aug 1, 2008
    Location:
    Vancouver, BC
    #6
    Turbo boost is a form of built-in overclocking that Intel has implemented in the Nehalem architecture.

    It uses thermal headroom due to a couple of cores being inactive, to increase the clock multiplier on one or two cores that are actively processing, thus increasing their clock speed.

    So a CPU that is rated for 2.93x4 can actually operate with 2 cores at 3.3GHz while 2 cores are effectivly shut-down/idle.

    It effectively offers the best of both worlds... fast clocks for single-threaded workloads and more cores for multi-threaded workloads, without exceeding the thermal design limits of the system.

    It's a great feature.
     
  7. thread starter macrumors 6502a

    Joined:
    Oct 20, 2009
    Location:
    Portland, OR
    #7
    oh... so... nothing special if all cores are being used.
     
  8. macrumors 604

    wordoflife

    Joined:
    Jul 6, 2009
    #8
    Not exactly.

    If all cores are being used, it can increase too (depending on the processor). For example on the i5-750, if two cores are being used, and two cores are shut off, then it will overclock those two cores to 3.2ghz, but if all cores are being used, it can overclock all cores to 2.8ghz.

    Depends on the processor.
     

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