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32-bit or 64-bit?
- The default setting will be 32-bit which most applications are still using. If you are not sure which version you are running, you can check by doing the following:
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- Go to Apple menu
- Select About this Mac
- Click on More Info
- The Apple System Profiler will open.
- Click on Software and check the "64-bit Kernel and Extensions" option.
- A "yes" means you are running 64-bit. A "No" means you are running 32-bit.
To switch
- To change which kernel you are using, reboot and hold down either "64" or "32" on your keyboard. At this time, only the following Macs can use the 64-bit kernel:
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- Mac Pro (Early 2009), by default uses 64-bit
- Mac Pro (Early 2008), by default uses 64-bit
- iMac (Early 2009)
- iMac (Early 2008)
- For more information: http://support.apple.com/kb/HT3773
- Note for Boot Camp users: Win 7 also runs in either 32 or 64-bit but can't be switched automatically like the Mac. It has to be done by using a clean install.
64-bit processor or kernel?
- They are not the same. The Intel Core 2 Duo and the Intel Quad-Core Xeon are 64-bit. Anything built previous to that is 32-bit. To see if you're running a 64-bit processor, check with Apple: http://support.apple.com/kb/HT3696
Symantec 11 for Mac
- Available in 64 and 32 bit. Testing is being done on this subject.
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