Determine architecture (x86 or x64)

I'm trying to determine the architecture of a pc I have whether it is x86 or x64.

Dell Optiplex 380, Intel Core 2 Duo E7500
http://ark.intel.com/products/36503/Intel-Core2-Duo-Processor-E7500-(3M-Cache-2_93-GHz-1066-MHz-FSB)

Dell Optiplex 390, Intel i5-2400
http://ark.intel.com/products/36503/Intel-Core2-Duo-Processor-E7500-(3M-Cache-2_93-GHz-1066-MHz-FSB)
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mcnuttlawAsked:
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edster9999Commented:
Those are both 64 Bit processors.  What is the question ?
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Dr. KlahnPrincipal Software EngineerCommented:
As long as the host system is running Windows, the freeware CPU-Z can determine the CPU type, memory type and speed, and considerable other information about the system.  This is useful when the BIOS doesn't display CPU information, or more information is desired than the simple CPU type listing from Control Panel/System.

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nobusCommented:
here is how MS does it :  http://support.microsoft.com/kb/827218
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nobusCommented:
i find you selected the wrong answer - your question was "I'm trying to determine the architecture of a pc I have whether it is x86 or x64."

and you selected "Those are both 64 Bit processors"
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