Microsoft developed a hotfix for multiple processor boards(boards with two not one cpu) that is intended for use when you see drastic performance losses. The article is seen at
http://support.microsoft.com/?id=896256
How to disable the new performance state policy behavior
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Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
After you install the hotfix that is described in this article, you may use registry settings to disable the new performance state policy behavior. To do this, follow these steps: 1.Click
Start, click
Run, type regedit, and then click
OK.2.Right-click
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager, point to
New, and then click
Key.3.Type Throttle for the new key name.4.Right-click
Throttle, point to
New, and then click
DWORD Value.5.Type PerfEnablePackageIdle for the value name.6.Right-click
PerfEnablePackageIdle, and then click
Modify.7.In the
Value data box, type 0. Make sure that
Hexadecimal is selected in the
Edit DWORD Value dialog box, and then click
OK.
Note You can type 1 in the
Value data box to enable the new performance state policy behavior.8.Quit Registry Editor.