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All replies
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Helpful answers
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Jan 23, 2012 10:18 PM in response to dan woolby Linc Davis,★HelpfulIs this even necessary though?
No.
Will I still be able to access RAM beyond the 4gb cap while booted into 32bit mode?
Yes.
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Jan 24, 2012 6:02 AM in response to dan woolby The hatter,★Helpful2009 and you should if you want be able to boot 64-bit mode.
What happens when you try?
Of course you need to insure that your drivers and plugins are 64-bit and will still work.
There are some benefits to 64-bit mode and performance for some apps.
See if www.macperformanceguide.com has some tips
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Jan 24, 2012 10:21 AM in response to The hatterby dan wool,Despite what my sig says, I have an early 2008 3ghz 8core (I don't know why it says that and I can't figure out how to change it). It simply stays in 32bit mode if I hold down the 6 and 4 keys on startup, but no matter. I've done more research and I believe what Linc Davis says so succinctly is true. Thanks for responding!
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Jan 24, 2012 10:28 AM in response to dan woolby The hatter,2008 Mac Pro can, it is supported on server OS.
http://support.apple.com/kb/HT3770
Method 1: Startup key combination (for current startup only)
- If your Mac uses the 32-bit kernel by default, but supports the 64-bit kernel, you can start up using the 64-bit kernel by holding the 6 and 4 keys during startup.
- If your Mac uses the 64-bit kernel by default, you can start up with the 32-bit kernel by holding the 3 and 2 keys during startup.
Your Mac will revert to the default kernel the next time you reboot it.
Method 2: On-disk setting (persistent)
To select the 64-bit kernel for the current startup disk, use the following command in Terminal:
sudo systemsetup -setkernelbootarchitecture x86_64
http://support.apple.com/kb/HT3773
Early 2008 implemented Unified EFI which is 64-bit but you need to run 10.6.x and even then... so much for "64-bit" hardware and OS talk we heard for years.
http://macperformanceguide.com/SnowLeopard-Compatibility-software.html
Even if you cannot or do not boot the Mac OS X Snow Leopard kernel into 64-bit mode, you can run your 64-bit apps as 64-bit, and they can take advantage of all the memory in the machine. This was/is possible even with Mac OS X 10.5 Leopard. The main problem being that there are only a handful of 64-bit applications available as of September 2009.
http://macperformanceguide.com/SnowLeopard-64bit.html
Somewhere in your "default product" in your profile is where I think the forum pulls that sig