issue disabling speedstep

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jamescater
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2008/05/12 19:41:35 (permalink)

issue disabling speedstep


Folks,

Can anyone help me here.

I installed Windows XP with speedstep enabled and this underclocks the CPU multiplier from 9 down to 6 when the CPU is idle.
Unfortunately this means that sonar has problems starting large projects that are close to the max CPU.

When I now disable this speedstep function in BIOS then Windows XP sometimes fails to load the ATI display driver on boot and the only way out is to recover the C drive with Norton Ghost.

Question: Is there anything I can do to get Windows XP to recognise the change in BIOS config correctly without re-installing the entire O/S ?

Thanks in advance,

James.

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    bitflipper
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    RE: issue disabling speedstep 2008/05/12 21:13:55 (permalink)
    I was under the impression that speedstep only kicked in when you're running on batteries, although there is a newer version of speedstep ("enhanced") that runs even when on AC. Maybe that's what you've got.

    Intel has a free utility for configuring or disabling speedstep, which I've used for years without problems. But I have never run SONAR on a laptop so I have no idea what kind of issues speedstep might cause. You might want to give the SpeedstepXP utility a try.

    Here's a good FAQ about SpeedStep.


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    cedric
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    RE: issue disabling speedstep 2008/05/13 05:15:20 (permalink)
    James,

    Reactivate Speedstep in the Bios.

    Back in Windows XP, under Control Panel, choose the Power Management applet, then choose the Home/Office Desk power scheme.
    This effectively deactivates Speedstep.

    Cedric


    post edited by cedric - 2008/05/13 05:35:41
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    rosabelle
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    RE: issue disabling speedstep 2008/05/13 09:53:37 (permalink)
    Here's a link that discusses XP and Speedstep.

    So after reading that, I set speedstep enabled in BIOS, and set my power scheme to Always On. That should effectively disable speedstep, right? But according to CPU-Z, there is still CPU throttling happening on my machine.

    So, in a nutshell, I don't know the solution to your problem, and I don't really know who to believe. Anyone else have any knowledge on the subject?
    #4
    jamescater
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    RE: issue disabling speedstep 2008/05/16 12:33:46 (permalink)


    If you have an ASUS motherboard they have implemented their own throttling in the BIOS

    It's called Enhanced C1 (C1E)


    This may be causing my problems as well.

    I've currently got SpeedStep and C1E enabled and I'm back to a PRE Windows XP SP3 build and everything is stable agian

    Sometime over the weekend I'm going to play around with the options to find out which of the following is causing the ATI drivers to go nuts.

    C1E
    SpeedStep
    XP SP3


    #5
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