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Published on 05.14.09 by Brent Trahan

Set PCI Express Link State Power Management

Learn how to set Windows 7’s PCI Express Link State power management to moderate power savings, maximum power savings, or turn it off.

  1. Open the Control Panel in the Start menu.
  2. Open Power Options in the Control Panel.


    Note: If Power Options is not available, change View by to Large icons at the top right of the Control Panel.

  3. Select Change plan settings next to the power plan you want to set.


  4. Select Change advanced power settings.


  5. Select Change settings that are currently unavailable.


  6. Set the Link State Power Management under PCI Express and then click OK to save the changes.


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5 Responses to “Set PCI Express Link State Power Management”

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  1. Tim says:

    Okay, but what does it actually do?

  2. John says:

    What the heck is the point of this?

    • SH code says:

      Oh god, that’s exactly what I asked myself when I saw it in this options panel, and that’s why I’m googling right now. And it seems we’ve got our answer:

      Active State Power Management (ASPM) allows power to be incrementally reduced to individual serial links in a PCI Express fabric as a link becomes less active. ASPM is defined in the PCI Express base specification. Microsoft Windows Vista supports ASPM through enhancements to the PCI bus driver and Microsoft Windows power manager. Windows Vista enables or disables ASPM for a Link, based on the overall system power policy, the hardware capabilities of the Link, and the latency of the Link. Hardware performs the actual power management operations of transitioning Links between Link power states and resynchronizing Links. The configuration of the PCI Express implementation on a system affects the amount of power savings that can actually be achieved.


      • xagx says:

        so the point is ????
        pls explain it more clearly?? i still don’t know what is this mean

        • Beepbeep says:

          True, this is a how to enable or disable something that you don’t even know why it is there. Most find this via the advanced power options in windows, right?

          My basic understand is it cuts power to devices, thus saving power, but when you want that device it has a delay before it is started again. I suggest have on for battery use and off for normal (plugged in) use.

          Anyway, this explains it in terms even I can understand http://en.wikipedia.org/wiki/Active_State_Power_Management

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