It is important to know if your Mac's Intel processor is 32 or 64 bits so you can take advantage of the latest features offered by Mac OS X and so you can select programs that are appropriate for 32- or 64-bit Macs. According to Apple, 32-bit applications can only use 4 GB of RAM at a time, but 64-bit applications can use a theoretical 16 exabytes of RAM at a time. This allows your computer to operate more efficiently by speeding up calculations and tasks.
Click the "About this Mac" option on the "Apple" menu. Click the "More Info" option.
Click the "Hardware" option located under the "Contents" menu on the left side of the window.
Look at the "Hardware Overview" on the right side of the menu, and locate the "Processor Name."
Determine whether your processor is 32- or 64-bit by locating your processor's name from below:
32-Bit Processors: Intel Core Solo and Intel Duo
64-Bit Processors: Intel Core 2 Duo, Quad-Core Xeon, Dual-Core Xeon, Quad-Core Xeon, Core i3, Core i5 and Core i7
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