CPU 32-bit or 64-bit

Hello,
how to know the speed of my CPU 32-bit or 64-bit.
My CPU: Intel Pentium 4 531, 3000 MHz(15 x 200).
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  1. Hello willi2d;

    Your Pentium 4 531 uses a 32bit instruction set.
    http://ark.intel.com/Product.aspx?id=27463

    The Pentium 4 6xx CPUs made the switch over to 64bit instructions.
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