![]() The OS is running in 64 bit, just not the kernel. (even after I tried holding "4" and "6" while reseting it, it's still 32 bit) Mine is MB White 4.1 in Early 2008 with 4Gig RAM.īut SL runs only 32bits. Kernel (which you don't really need for that machine), the OS itself will run in 64 bit as well as all 64 bit apps. My 2007 MacBook has a Core 2 Duo processor but has a 32 bit EFI. OS X Snow Leopard (10.6): 64 bit everything, boots 32 boot kernel on consumer machines.Ĭompare this to M$, who require that you install a completely different OS in order to get 64 bit goodness (thereby losing support for apps that need 32 bit).ĭoesn't the MacBook have to have a 64 bit EFI to run Snow Leopard in 64 bit? The newer MacBooks do have a 64 bit EFI. OS X Leopard (10.5): 32 bit GUI, kernel and extensions, support for 64 bit GUI applications. OS X Tiger (10.4): 32 bit GUI, kernel and extensions, support for 64 bit background processes The progression of OS X into 64 bit is a good example of Apple being careful to support everyone without hassle: It also buys some time for 3rd party manufacturers to get their drivers up-to-64 bit. There is no problem with this - as desktop/laptop computers are extremely unlikely to require the kernel to address more than 4GB of RAM. ![]() The Snow Leopard "kernel" runs in 32 bit mode on most "consumer" Macs, even though it runs nearly all other application/extensions in 64 bit mode.
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