HT3773: OS X: Starting up with the 32-bit or 64-bit kernel
Learn about OS X: Starting up with the 32-bit or 64-bit kernel
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All replies
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Helpful answers
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Oct 15, 2012 1:57 PM in response to shivaparasramby Allan Eckert,Mountain Lion is 64 bit.
What makes you think your Mac is not running 64 bit?
Allan
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Oct 15, 2012 1:58 PM in response to shivaparasramby Kappy,You can boot the computer and after the chime press and hold down the 6 and 4 keys together until the spinning gear appears. This should put the computer in the 64-bit kernel. You can make the change permanent by using a utility such as 32- or 64-bit Kernel Startup Mode Selector 1.6.
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Oct 15, 2012 1:59 PM in response to Allan Eckertby Kappy,The '09 Mac Pro doesn't boot automatically into 64-bit kernel, only the 32-bit.
These Macs use the 64-bit kernel by default in Mac OS X v10.6.
- Mac Pro (Mid 2010)
- MacBook Pro (Early 2011)
- iMac (21.5-inch and 27-inch, Mid 2011)
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Oct 15, 2012 2:03 PM in response to shivaparasramby infinite vortex,Mountain Lion won't boot with a 32-bit kernel. If you're running a unmodified OS X 10.8.x then you're not running in 32-bit.
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Oct 15, 2012 2:07 PM in response to infinite vortexby Allan Eckert,Thank you.
That is what I found on a web page which I was looking for just now but you beat me to itt.
Allan