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Q: How to chage to 64 bit from 32 bit
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Apr 28, 2012 8:26 AMby John Galt,Lion runs in 64 bit mode and requires a 64 bit processor. If you're running Lion you're already using it.
See for yourself: check About this Mac, More Info… System Report > Software.
Macs that use the 64 but kernel: http://support.apple.com/kb/HT3770
