- From the Menu Extras area, click the Apple icon.
- Click About This Mac.
- Click More Info.
- Expand Hardware.
If you do not see Hardware as an option, close the About This Macwindow. Click the Apple icon and press the Option key on your keyboard. System Information appears as the first option in the list. While pressing the Option key, click System Information.
- Locate the Processor Name.
Compare the Processor Name to the information below to determine whether your Mac has a 32-bit or 64-bit processor.