How to Check if Your Computer Is 64 Bit
This article explains how to determine whether your computer/server is running a 32-bit or 64-bit version of a MS Windows Operating System.
For Windows 7/Vista/Server 2008/R2
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(1) Click on the Start Button: (2) Type 'System' in the Start Search box, and then (3) click "System" in the Programs list.
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In the "System" window it will state either "32-bit Operating System" or "64-bit Operating System".
For Windows XP/2000/Server 2003
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Press the WIN+R keys (Windows key and R). Type the following: sysdm.cpl and click OK.
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Click on "System Summary": Under "System Type" it will either state "x86" if a 32-bit version of Windows is installed, or "EM64T" if a 64-bit version of Windows is installed.
For Mac OS X
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Launch Terminal app (see Applications/Utilities)
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At prompt, type the following: "uname -a" (without the quotes) (note the blank space between "uname" and "-a" strings.
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The terminal will display two lines of text. At the end of the 2nd line, you'll find something like either
- RELEASE_I386 i386 ; the latest "i386" means that you're running 32bits kernel
- RELEASE_X86_64 x86_64 ; the latest "x86_64" means that you're running 64bits kernel
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