Change BIOS Settings

Discussion in 'Windows, Linux & Others on the Mac' started by rpboyle, Nov 16, 2006.

  1. rpboyle macrumors newbie

    Nov 16, 2006
    Can any extraordinarily kind person tell me how, or definitively whether it's even possible to access my BIOS settings in XP running on a C2D Mac?

    A certain program for which I *need* Windows access is telling me some BIOS attributes must be altered for smooth sailing.

    If it matters, I'm running:

    Windows XP Pro 2005 SP2
    OS X 10.4.8
    Bootcamp 1.1.1
    iMac 24" 2.33

    Thanks a ton.
  2. Transeau macrumors 6502a


    Jan 18, 2005
    Alta Loma, CA
    The Intel Mac's have no BIOS, only some basic Emulation.
    The EFI turns on the emulation (the delay you see before Windows starts to boot). Unfortunately, you have no control over these settings.

    What is it that you need changed?
  3. rpboyle thread starter macrumors newbie

    Nov 16, 2006
    I need to turn off multicore support, speed-stepping, and possibly on-board audio.
  4. displaced macrumors 65816


    Jun 23, 2003
    Gravesend, United Kingdom
    You should be able to address the multicore problem as follows:

    - Run the application you want to use
    - Right-click a blank area of the task bar and choose Task Manager
    - Click the Processes tab, and find the program in the list.
    - Right-click the program's name, and choose Set Affinity
    - Deselect CPU1, leaving just CPU0 selected.

    Speed stepping's trickier. It might be worth googling for Intel's speed step management software, although I'm not sure if it'll work with the Mac hardware.

    On-board audio can be disabled by finding the relevant devices in Windows' Device Manager, viewing the properties, and disabling the device.

    Out of curiosity, what's the app you're trying to run? It sounds rather fussy, since I can only imagine that the multi-core thing could be a problem. Speed Stepping should be pretty much invisible to the application - if it demands more power, SpeedStep should crank the machine up to its highest speeds automatically and transparently
  5. Transeau macrumors 6502a


    Jan 18, 2005
    Alta Loma, CA
    All easily addressed...

    For the CPUs add "/ONECPU" to your boot.ini line.

    For SpeedSteping, go to the Power Control Panel and change it to "Always On"

    For the Sound, Go to the Device Manager and disable the HD Audio

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