How To: Enable 64-bit As Default In OS X Snow Leopard – Overclock.net – Overclocking.net

How To: Enable 64-bit As Default In OS X Snow Leopard – Overclock.net – Overclocking.net.

http://www.ahatfullofsky.comuv.com/English/Programs/SMS/SMS.html

http://www.macupdate.com/info.php/id/32300/k64enabler

http://yourmacguy.wordpress.com/2009/08/24/boot-snow-leopard-64-bit/

And you will see either “EFI32” or “EFI64” returned to you.

If you have “EFI32” returned, you cannot enable 64-bit Kernel and Extensions, but you are still able to run 64-bit Applications.

Now, you can either continue to hold “6” and “4” everytime you want to boot, or you can do the following:

Navigate to the following location in Finder:

Quote:
/Library/Preferences/SystemConfiguration/com.apple.Boot.plist

From there, find this bit of text:

Quote:
<key>Kernel Flags</key>
<string></string>

And add arch=x86_64 between the <string> tags, so that you have this:

Quote:
<key>Kernel Flags</key>
<string>arch=x86_64</string>

Save the file, and reboot your machine. If you have a (capable) Mac, you will see “Yes” in System Profiler, instead of “No”.

If you want to boot into 32-bit, just hold “3” and “2” at boot, or edit the file again, and remove that string.

Hopefully this helps some of us with a Mac and Snow Leopard.

Cheers!

Edit: I have realized, that in System Profiler, it may still display “No”.

You can check if you are running 64-bit by default, by checking Activity Monitor, and next to each process, if it’s enabled as 64-bit, it will say “Intel (64-bit)”.

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