JSI Tip 9860. You lose processor power management features when you update the AMD processor driver on a multiprocessor computer that is running an x64-based version of Windows Server 2003 or Windows XP?

When you attempt to update the AMD processor driver on your x64 version of Windows Server 2003, or Windows XP, the original Microsoft in-box driver is installed, causing you to loose features on your multiprocessor computer.

This behavior will occur if a newer AMD processor driver was previously installed, because the driver ranking process assigns the in-box processor a higher rank that the newer AMD driver. The in-box .inf file has a hardware ID that is more accurate than the AMD .inf file.

To workaround this issue:

1. Right-click My Computer and press Manage.

2. Select Device Manager and expand Computer in the right-hand pane.

3. Right-click the processor you want to update, and press Properties.

4. Select the Driver tab.

5. Press Roll Back Driver.

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