The Intel® Processor Identification Utility requires the “Max CPUID Value Limit” in the system BIOS to be disabled for proper processor identification. Once processor identification has taken place, the option can be re-enabled if desired.
To disable the “Max CPUID Value Limit” option, enter the BIOS setup screen while booting the system. For Intel® Desktop Boards, follow these steps:

1. Press F2 while booting
2. Select the "Advanced" tab
3. Select "Boot Configuration" option
4. Set "Max CPUID Value Limit:" to "Disabled"

Operating System:

Windows* XP Professional x64 Edition, Windows Server* 2003 Standard x64 Edition, Windows Server* 2003 Enterprise x64 Edition, Windows* 2000, Windows* XP Professional, Windows* XP Home Edition, Windows Server* 2003, Windows* XP Media Center Edition, Windows* 2000 Server, Windows* 2000 Advanced Server, Windows Server* 2003 Standard Edition

This applies to:

Intel® Processor Identification Utility