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Thread: i7 Turbo Boost

  1. #1
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    i7 Turbo Boost

    Anyone have any experience with the i7 Turbo Boost feature. I know it is turned on automatically, but how much does it really help? Lets say you are playing a single threaded application, how high could the turbo boost alone, take you?

  2. #2
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    Re: i7 Turbo Boost

    Quote Originally Posted by SammiCurr View Post
    Anyone have any experience with the i7 Turbo Boost feature. I know it is turned on automatically, but how much does it really help? Lets say you are playing a single threaded application, how high could the turbo boost alone, take you?
    A great example I regularly run into would be Sins of a Solar Empire. It's a totally single threaded game, don't ask me why the devs didn't go multithreaded on this one, it could have definately used it. Turbo mode kicks in for this game and at stock speed of 2.66Ghz, it bumps up to 2.83Ghz. But, at 3.6Ghz, I leave turbo off.
    Ci7 920@3.6Ghz/6Gb Corsair DDR3 1600mhz/EX58-UD3R/AMD Radeon HD4870 512/4x 750Gb Seagate 7200.11
    C2Q Q6600/4Gb G.Skill Pi Black DDR2 800/IP35 Pro/8800GTS 640mb/2x 200Gb SATA Caviar

  3. #3
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    Re: i7 Turbo Boost

    I tend to agree: if running at stock, or near it, you might as well leave it enabled. But if running near the edge, leave it off, because it will affect stability.


    M

  4. #4
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    Re: i7 Turbo Boost

    Personally I'm using turboboost for 21x191 4ghz which actually allowed me to achieve that speed at a lower vcore and qpi voltage than running 20x200.

    I have disabled cstates however to keep it from shutting down cores and jumping to the 22 multiplier.

    The same principles of overclocking and stability testing apply with or without turboboost, turboboost just gives you one high multiplier.

    Even running at the edge should not be an issue if you actually did your stability testing with turboboost enabled. Where I run into some strange issues is with full c7 cstate enabled, where it disables three cores and pushes the multiplier to 22.

    If you disable the cstates turboboost is basically one free multiplier and speedstep will still works fine as well with turboboost.
    i7 Beast: Asus P6T Deluxe, Intel i7 920 21x191 (4000) HT on 1.3875v, Swiftech GTZ/D5/BIX2
    6GB (3x2GB) G.Skill pi Black DDR3 1600, ECS 9600GT
    CM STACKER 810, PC Power & Cooling Silencer 750


    i7 Game: Asus P6T, Intel i7 920 20x180 (3600) HT on 1.275v, TRU-120
    6GB (3x2GB) G.Skill DDR3 1333 7-7-7-18, MSI GTX260 OCv2, Dell 3007WFP LCD
    CM STACKER 830, PC Power & Cooling Silencer 750


    AMD: Biostar 790GX A2+, PII X4 940BE 17x200, Freezer 64 Pro
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  5. #5
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    Re: i7 Turbo Boost

    I have to correct myself on an earlier point. While messing around at stock speed today (bios flash, yay me!), I got back into Windows and decided to play a little further of a savegame in Sins for a bit. When I launched it, I saw the CPU speed jump up to 2.93Ghz, a 2 multi over stock 2.66Ghz. So it can jump one or even 2 places up. That's pretty cool

    Going back to 3.6Ghz, I see no need for such a boost when I'm already boosted through the roof. Turbo is back off again.
    Ci7 920@3.6Ghz/6Gb Corsair DDR3 1600mhz/EX58-UD3R/AMD Radeon HD4870 512/4x 750Gb Seagate 7200.11
    C2Q Q6600/4Gb G.Skill Pi Black DDR2 800/IP35 Pro/8800GTS 640mb/2x 200Gb SATA Caviar

  6. #6
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    Re: i7 Turbo Boost

    I don't use turboboost on my 3.6ghz oc either but when it comes to the higher clock speeds turboboost is much more useful.

    If I'm not mistaken a majority of the big clocks achieved with 920's is done with turboboost and the 21 multiplier.

    I definitely agree that at 3.6ghz is plenty fast but a turboboost'd 4ghz is simply tinkering joy, not needed but its more fun.
    i7 Beast: Asus P6T Deluxe, Intel i7 920 21x191 (4000) HT on 1.3875v, Swiftech GTZ/D5/BIX2
    6GB (3x2GB) G.Skill pi Black DDR3 1600, ECS 9600GT
    CM STACKER 810, PC Power & Cooling Silencer 750


    i7 Game: Asus P6T, Intel i7 920 20x180 (3600) HT on 1.275v, TRU-120
    6GB (3x2GB) G.Skill DDR3 1333 7-7-7-18, MSI GTX260 OCv2, Dell 3007WFP LCD
    CM STACKER 830, PC Power & Cooling Silencer 750


    AMD: Biostar 790GX A2+, PII X4 940BE 17x200, Freezer 64 Pro
    4GB (4x1GB) Ballistix Tracer DDR2 800, Powercolor 4850
    Corsair VX450

  7. #7
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    Re: i7 Turbo Boost

    In stead of Turbo boost I choose to overclock my i7. Mine is running 3.6GHz 24/7 (it can run higher, 4.5GHz).
    I would recommend a small overclock over turboboost. If it is stable for a boost to 2933MHz (22x133) on stock voltage, why not always set it to that speed (without turbo) by raising bcclock to 145MHz (and checking other settings). My cpu can run 3.2GHz at it's stock voltage (prime stable that is).
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  8. #8
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    Re: i7 Turbo Boost

    I almost always use Intel Turbo Boost. It seems to simply enable a 21X multiplier for the 920. I have never seen a 22X multiplier, but then again I always have C-states disabled, EIST, and PROCHOT disabled at all times.

    With the 21X multiplier it helps to achieve a higher CPU clock without pushing the Northbridge BCLK too high. It also helps if your memory is of lower speed and you start to run out of low end multipliers. For example my daily settings are BCLK=180; Memory=10X180=1800; and CPU=20X180+Turbo=3800, nice round and even numbers. If I wanted to run the same CPU frequency without TurboBoost then the BCLK will be 190, but my memory is not very stable above 1866 without having the chip DRAM voltage set in the red/purple zone(over 1.64v), so I settle for a 8X multiplier and only net memory frequency of 1520.

    In my experience Intel Trubo Boost only changes the multiplier to 21X, and it is always set to 21X if all energy saving BIOS parameters are disabled. Here are two pages from x-bit labs on the subject:

    Turbo Boost

    Turbo OC

  9. #9
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    Re: i7 Turbo Boost

    Just for the record (watch the multiplier!):



    The states should be on and choose the correct power scheme.
    Asus R5E, Intel Core i7 5960X
    Cascade cooling (-94C @550W)
    G.Skill DDR4 3600C15@4266MHz cas12 Nvidia GTX730, Samsung 850 Evo/OCZ Vertex 4
    and Seasonic Platinum 1200Wi, Dell Ultrasharp U2711 and 20-50 more systems...



  10. #10
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    Re: i7 Turbo Boost

    Quote Originally Posted by Sparks View Post
    Just for the record (watch the multiplier!):



    The states should be on and choose the correct power scheme.
    Yeah. Check the multiplier:
    e: it is 23

    Last edited by temexter; 12-02-2009 at 08:54 PM.

  11. #11
    Joined
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    1

    Re: i7 Turbo Boost

    Sparks, Thanks for mentioning the correct power scheme.
    Once I changed it to Performance my x3460 went from 2.80 to 2.933 with no load.

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