Recent | Online | Vintage | Modern | Win | Mac  OS9 | DOS | Amiga | Atari ST | Graphics | Midi io | Sequencers | Roland "MC" | E-mu | Ensoniq | Akai MPCs | Samplers | Akai "S" | Roland "S"Synths | VST Samplers | VST Synths | Roland "JV" | Modules | Drums | Mixers | Timeline | HackintoshArtists | Graphics

Welcome to Oldschooldaw.com! (Online since 2014) if you are human, Register & Login to gain more access to all boards here; Some guest permissions have been limited to reduce traffic from bots and encourage registration, while other Guest permissions have been added such as guest posting of attachments and guest responses to threads!

Author Topic: is OSX 10.5 Leopard 64bit or 32bit?  (Read 340 times)

0 Members and 1 Guest are viewing this topic.

Offline chrisNova777

  • Underground tech support agent
  • Administrator
  • Posts: 9649
  • Gender: Male
  • "Vintage MIDI Sequencing + Audio Production"
    • View Profile
    • www.oldschooldaw.com | vintage audio production software + hardware info
is OSX 10.5 Leopard 64bit or 32bit?
« on: November 16, 2023, 04:54:24 PM »
Quote
Since Leopard is 32-bit it can address up to 4 GBs per processor.

For Core 2 Duo machines the maximum is, therefore, 8 GBs.

For 4-core machines it's 16 GBs,
and for 8-core machines it's 32 GBs.

Of course SL is 64-bit so the maximum is much greater.

But from a purely practical point of view the limit is determined by the largest compatible RAM module and the number of RAM slots in the machine. The 8-core Mac Pros have 8 slots. The largest compatible module is currently 4 GBs, so those machines can install up to 32 GBs.
https://discussions.apple.com/thread/2368815

not sure i agree with the rational behind this answer 100% because my g5 only had one processor and it had a max ram of 8gb with 8 slots of DDR1 and it comes from 2003, not 2007.

Quote

The short answer is that Leopard is a mix of 32-bit and 64-bit.

    Tiger added 64-bit support for low-level system libraries, enabling 64-bit for non-GUI applications.
    Leopard added 64-bit support throughout the system frameworks, so any app can be 64-bit.
    Snow Leopard will add a 64-bit kernel and many 64-bit user applications shipped by Apple. The 32-bit versions of all the frameworks and libraries are of course still available, but running apps in both modes requires both stacks to be loaded, which is inefficient, and a big reason why Apple is strongly encouraging developers to get on the boat and build their apps with a 64-bit version.

so the true answer is that leopard was part of a transitional phase over many iterations of versions of OSX
that began with TIGER and transitioned to supporting 64bit 100% in LION.
and completed with 32bit support being fully deprecated  + removed in CATALINA

Offline chrisNova777

  • Underground tech support agent
  • Administrator
  • Posts: 9649
  • Gender: Male
  • "Vintage MIDI Sequencing + Audio Production"
    • View Profile
    • www.oldschooldaw.com | vintage audio production software + hardware info
Re: is OSX 10.5 Leopard 64bit or 32bit?
« Reply #1 on: November 16, 2023, 05:12:56 PM »
Quote
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.

To select the 64-bit kernel for the current startup disk, use the following command in Terminal:


sudo systemsetup -setkernelbootarchitecture x86_64


To select the 32-bit kernel for the current startup disk, use the following command in Terminal:


sudo systemsetup -setkernelbootarchitecture i386


Note: This setting is stored in the /Library/Preferences/SystemConfiguration/com.apple.Boot.plist file and will take effect every time you start up from this disk. If you start up from a different disk, the setting on that disk, or the hardware default, will take effect.