View Full Version : Macbook Air defaults to 32-bit Kernel, force 64-bit?

Mar 21, 2011, 08:57 PM
I've checked the system profiler and my macbook air 11" ultimate (4 gb ram) is running with the 32-bit kernel. I would like to run it at 64-bit -- is there a way to force it to do this? Will there be any noticeable difference in performance?

Mar 21, 2011, 09:28 PM
I don't believe there is a way to force the MacBook Air to use the 64-bit kernel (holding down the 6 and 4 keys doesn't work). In any case, with only 2 or 4 GB of RAM, the 64-bit kernel wouldn't make that much of a difference.

Mar 21, 2011, 11:04 PM
There is really no benefit of a 64bit kernel, on the MBA or most other macs, also long as the apps can run 64bit then all is fine. Also keep in mind not all drive drivers are 64bit, and might have issue running with a 64bit kernel.

May 3, 2011, 09:51 PM
I'm using Mac OS X 10.6.7. on new Macbook Air (4GB). It won't boot with 64 bit kernel no matter what! my need is not a performance problem. I need to install "Togl" from source code and it won't get through unless the computer is in 64 bit kernel mode. It can be forced to boot in "64 bit kernel boot mode" but will still run with "32 bit kernel" (according to "Startup Mode Selector.app"). So the "uname -m" command gives "i386" as output. I need to get the output to be "x86_64" to be able to compile Togl. Can someone help please???

May 3, 2011, 11:39 PM
This has been discussed before. There is no way to get the MBA kernel to run 64 bit without hex editing some system files.

However in Lion the kernel will run 64 bit mode. It's not a hardware limitation it's software.

What is Togl? No app should know or care what the kernel is running as. Apps can be run in 64 bit mode without the kernel running in 64 bit mode.