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surface book 3 12watt cpu stuck

Astounded 0 Reputation points
2026-06-15T20:42:07.5066667+00:00

i recently bought a surface book 3 and this thing has been extremely slow i went through so much trouble trying to figure out the issue and for some reason the cpu refuses to go above exactly 12 watts causing this issue,found using throttlestop win11 this is the 13.5 inch model

edit: so uhh the problem fixed itself yeah i uhh ran a benchmark trying to figure more stuff out and uhh problem gone

Surface | Surface Book | Performance and maintenance
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  1. AI answer

    2026-06-15T20:42:21.0366667+00:00

    On Surface Book 3, CPU power and performance are tightly managed by firmware, Windows power mode, and thermal limits. If the CPU is stuck around 12 W and performance is very slow, check and adjust the built‑in controls rather than relying on third‑party tools.

    1. Verify supported OS and updates
    • Ensure the device is running a supported OS version (Windows 10 1903+ or Windows 11 21H2+ for Surface Book 3) so the power/thermal logic and GPU switching work as designed.
    • Use the Surface app → Help & support → Check for updates to confirm all Surface firmware and drivers (including System Aggregator and Integration Service) are current, then install any pending Windows Updates and restart.
    1. Set Windows power mode to performance On Windows 11:
    2. Go to Start > Settings > System > Power & battery.
    3. Under Power mode, select Better performance or Best performance.

    On Windows 10 (if applicable):

    1. Select the battery icon on the taskbar.
    2. Move the Power Mode slider to Better performance or Best performance.

    Surface Book 3 uses this setting to adjust CPU power caps (PL1/PL2), turbo behavior, and fan RPM. When plugged in, it should default to “Best performance,” which allows higher CPU power and enables the NVIDIA dGPU on i7 models.

    1. Plug in and manage thermals
    • Use the device while connected to the original Surface power supply; on battery, aggressive limits can keep CPU power low to extend runtime.
    • If the device is hot, move it to a cooler place, close heavy apps (games, video, many browser tabs), and let it cool for several minutes. Overheating can force sustained low power limits.
    1. Avoid conflicting tweaks
    • Third‑party utilities like ThrottleStop can conflict with Surface’s own power management and may lock the CPU into conservative limits.
    • After setting Windows power mode to Best performance, test behavior without ThrottleStop or other tuning tools running.
    1. Restart after changes
    • After installing firmware/driver updates or changing key power settings, perform a full restart: Start > Power > Restart.

    If, after updates, best‑performance mode, AC power, and normal thermals, the CPU still never exceeds ~12 W under sustained load, contact Surface support for hardware‑level diagnostics.

    References:

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