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) proudly SSL-FREE! and serving vintage computers worldwide! 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.

Author Topic: is OSX 10.5 Leopard 64bit or 32bit?  (Read 854 times)

0 Members and 1 Guest are viewing this topic.

Offline chrisNova777

  • Underground tech support agent
  • Administrator
  • Posts: 9721
  • Gender: Male
  • "Vintage MIDI Sequencing + Audio Production"
    • 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
« Last Edit: November 17, 2023, 04:33:40 AM by chrisNova777 »

Offline chrisNova777

  • Underground tech support agent
  • Administrator
  • Posts: 9721
  • Gender: Male
  • "Vintage MIDI Sequencing + Audio Production"
    • 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.