Snow Leopard System Mode Configurator Preference Pane - 32/64 bit boot selector
SystemModeConfigurator is a system preference pane application which can switch Your Mac kernel boot mode to 32/64 bit (it uses nvram boot-args). On systems other than Snow Leopard it only displays Your system capabilities to run 64bit kernel. It also can turn on verbose boot/shutdown kernel mode - now You can see what happens during boot time and You can impress Your geeky Linux friends ;-)
It is important to know that there are no good reasons to run machines with less than 4 GB RAM in 64 bit mode. Snow Leopard runs 32/64it applications in both modes (look at Activity Monitor application). The only real differnce is that 32 bit mode cannot run 64 bit kernel extensions and vice versa (so VirtualBox and Parallels Desktop may not run in 64bit mode). Feel free to experiment with 64 bit technology.
Only machines with 64 bit EFI and machines that Apple offcially claims that are compatible can boot 64 bit.
Snow Leopard 64bit compatible machines:
After download/unpacking click on SystemModeConfigurator.prefPane file in Finder. It will be installed in Your System Preferences:
If everything goes well You should see SystemModeConfigurator panel and System Mode icon at the bottom of the System Preferences main screen.
If You notice any undesired behaviour please leave comment at the bottom of this page or mail me.
- runs on Intel Macs (10.5.x or later)
- change boot mode to 64bit/32bit on Snow Leopard
- check Your EFI type on Leopard/Snow Leopard
1.1 - 2009.09.23
- now it uses more standard way to authenticate admin operation in System Preferences
- it is possible to turn on verbose mode to impress Your Linux Geek friends :-)
- shows boot parameters in advanced tab
1.0 - 2009.09.13
- initial public version
(C) 2009 Copyright by IGI-SOFT Igor Popik. This software is freeware. Full license text is available here.
This is a great tool, any plans to make it work on Lion ?? Thanks.
THIS IS WHAT WORKED FOR ME ON MY MBP 8,2 i7 2.2 8Gb Ram https://discussions.apple.com/message/13282630?messageID=13282630
Hi there, I\'ve installed your systemmodeconfigurator however, I have a MacbookPro 8,2 and its default kernel is 64 bit, even when I use your configurator and choose 32-bit under Advanced I still get it to boot as 64bit. I cannot use the 3-2 keys in the beginning since I have my firmware locked and I prefer that way. I just need to run the machine in 32-bit once in awhile. Suggestions are appreciated. Thanks.
Unfortunately..this software didn\'t work for me trying to boot into 32 bit on my Macbook pro 8.2 w/mac OSX 10.6.7 no matter what! Why?
nice, really nice
AFAIK MacPro1,1 will not boot in 64bit mode kernel, since it has 32bit EFI - but it is capable of running 64 bit applications in 32bit kernel mode.
Iss my 2006 Mac Pro 1,1 capable?
I have just added info how to uninstall this preference pane - just remove it from System Preferences with \"right\" click.
How do you delete this program from a macbook 64 bit efi 32 bit kernal It doesn\'t seem to work on my machine.
Well, it works. But in normal life there is no performance boost from 64 bit mode :-)
Advertising your own program on competitors website is considered bad etiquette - especially without disclosure.