gonX

Considering this is a very nice guide, I've decided that making it stuck was a good idea

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Please direct all tech related questions to a thread in the respectable forums, and not to my PM inbox. Thank you

sdla4ever

thanks gonx, has anyone seen a noticable performance increase? or specific app increase?

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LMC

Copy and paste this line exactly to terminal:
sudo nvram boot-args="arch=x86_64"

aircub

I updated to 10.6.1 and it turned my 64-bit setting off, using the above in terminal has not worked either.....any ideas..?

LMC

Sounds like your mac is not capable of running the 64 bit kernel. This doesn't mean you can't run 64 bit applications.

aircub

I had it running 64 bit on 10.6.0 however when i upgraded yesterday it switch it back to 32 bit and will not change now

LMC

That is very odd. I too updated and it remained to default at 64 bits. Good luck in finding the problem. Maybe do a manual download and reinstall 10.6.1?

mentholmoose

Quick bump for some information: this didn't work on my Macbook, even though it said EFI64 was available. In addition, to check whether it works, you need to check kernel_task (PID 0) to see if it's running as a 64-bit process. The line in System Profiler - 64-bit Kernel and Extensions - is in my experience entirely accurate.

Finally, running the kernel as 64-bit has no functional or performance improvements, mostly just an OCD improvement.

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halifax1

Quick bump as well, and the quoted text above is 100% true. Although my MacBook is running a 64-bit EFI, the kernel is still booted in 32-bit. From my understanding, there is a restriction that Apple has put in place on numerous MacBooks.

Also, like said above, there is little to no improved performance, other than your kernel being 64-bit, and even without a 32-bit kernel, I can still run all 32 and 64-bit applications and services.

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