Determine type of processor on your windows machine

Information about the processor type is stored in the PROCESSOR_IDENTIFIER registry entry in the following registry subkey:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment

The PROCESSOR_IDENTIFIER registry entry uses a string value that is described as follows:

• If the string value contains "AMD64" (without the quotation marks), the computer has an Advanced Micro Devices (AMD) AMD64 processor.
• If the string value contains "EM64T" (without the quotation marks), the computer has an Intel Extended Memory 64 Technology (EM64T) processor.

Note The value of the PROCESSOR_ARCHITECTURE registry entry in the following registry subkey is set to AMD64 regardless of the type of processor that the computer uses:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

To determine the processor type, use one of the following methods.

Method 1: Use the set command

To use the set command to determine the processor type, follow these steps:

1. Click Start, click Run, type cmd in the Open box, and then press ENTER.
2. At the command prompt, type set, and then press ENTER.
3. Note the string that is displayed next to PROCESSOR_IDENTIFIER.

Method 2: Use Registry Editor

To use Registry Editor to determine the processor type, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment
3. In the right pane, note the string that is displayed in the Data column for the PROCESSOR_IDENTIFIER registry entry.
4. Quit Registry Editor.

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Determine Type of processor