Snow Leopard 64 bit Technology
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Uploader Comments (UnknownAppleGuy)
All Comments (5)
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64 bit kernels do have performance gains, none presently but will in the future the reason the kernel boots in 32bit mode now is because there are still extentions and plugins being made and used in 32bit that simply wont load on the 64bit kernal. Its because nothing is ready yet and to save users experiencing problems.
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There is much wrong confusion about the 64bit element of Snow Leopard. Here is the simple breakdown.
Any Intel Core 2 Duo or Xeon processor will run applications in 64bit mode in Snow Leopard, straight out of the box. The old "core duo" chips will only do 32bit mode. All "core 2 duo" chips will run 64.
Booting into a 64bit kernel has no performance gains. That is why Apple defaults Macs to the 32bit kernel. Snow Leopard still runs all apps in 64bit mode, even if a 32bit kernel.
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Thanks for the rapid response. I was also doing research and i think i i found the answer to my question. In the system profiler under software. There its a menu that shows you: 64-bit Kernel and Extensions:No
My guess is when booting like you said holding 6 and 4 this will show that it is indeed in true 4 64 bit mode.
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It's true. There isn't any performance gains between the two kernels
UnknownAppleGuy 2 years ago
all of my apps says just Intel...?
runnig 10.6 on macbook 2Ghz Intel core duo
rodizani 2 years ago
That's a weird one. I really don't know what to say other than phoning Applecare. Truth be told they will probably tell you to reinstall the OS at this point.
UnknownAppleGuy 2 years ago
Can you show how to know if your running the 64-bit kernel
nickbmx2100 2 years ago
At this point there is no way to see if you're running the 64 bit kernel. In order to boot to the 64 bit kernel you need to hold down the "6" and "4" keys during start up. If you do that, then you will be booted into the 64 bit kernel, although there doesn't seem to be a way to tell at this point.
By the way, at this point the OS boots into the 32 bit kernel by default and there is no way to change that unless you manipulate the com.apple.Boot.plist. At this point I'm not clear on how to do it.
UnknownAppleGuy 2 years ago