Is Mac OS X Leopard (10.5.x) 32 bit or 64 bit?

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Nov 7, 2011 - Building a hackintosh—that is, installing Mac OS X on non-Apple. While this can be a little bit of a scary prospect if you're new to building a hackintosh. Off 64-bit Apple Boot Screen (unless your hackintosh has 32-bit.

Can I address more than 4GB of RAM?

4 Answers

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.

Because the kernel in 10.5 is still 32-bit, the greater amount of addressable memory is achieved with some trickery. The exact details evade me at the moment, but I think that under Leopard you can only address 4 GB of physical memory — I believe the 64-bit memory space spills over to virtual memory on disk, just like when 32-bit processes exceed the amount of installed RAM.

Edit: I was incorrect about the virtual memory aspect. The 32-bit kernel can address more than 4 GB of memory, but adding lots of physical memory uses up a good chunk (~ 1/3) of the kernel's 32-bit memory space, which (at the limit) can decimate kernel performance. Obviously, if your application uses more memory than is available (either in 32-bit or 64-bit mode), the OS must map virtual memory.

Among other things, the 64-bit kernel in Snow Leopard provides breathing room in the kernel itself by vastly increasing the address space it can use, including for describing physical memory. Most people aren't running into that limit yet, but they will start to as installed RAM increases in the near future.

I found this series very informative:

It goes into a fair amount of depth on Apple's 64-bit support and architecture over the last few years.

There is platform support for all of x86, x86-64, PowerPC. All new macs ship as x64.

Snow Leopard drops support for PowerPC.

If you are running on x64 then yes you can address more than 4GB of RAM.

Even if it is 64Bit though, you can successfully run 64Bit and 32Bit applications.

See this wikipedia page for reference.

The reason this is so confusing is that Mac OS X is the only OS that can run most of the 32-bit kernel in compatibility mode of long mode while running native 64-bit apps on top (in 64-bit mode of course). As a result, Mac OS X Snow Leopard actually has three modes. I have an article on my blog about it:http://yuhongbao.blogspot.com/2009/09/mac-os-xs-64-bit-modes.html

Not the answer you're looking for? Browse other questions tagged macosmac64-bitmemory or ask your own question.

We have published several guides on installing Mac OS X in normal PC with desktop virtualization software. You can find out all guides related to this topic here. Each guide is having several issues and drawbacks. Therefore I decided to publish another revamped complete guide on hackintosh 10.6.7 Snow Leopard on VirtualBox 4 with working sound.

Before continue the installation steps, let me summarize important issues fixed in this guide.

• This works with original (vanilla kernel) retail DVD or ISO file. No need to download any hacked OS X distributions.
• Third party boot loaders are not required to load the original Snow Leopard DVD or ISO file.
• Shutdown and Restart of Virtual machine works without crashing.
• ‘About the Mac’ option works without crashing and properly reading processor and memory (Intel Core2duo is in my case)
• Can be updated to latest 10.6.7.
• USB keyboard and mouse issue fixed after 10.6.7 update.
• USB storage (Flash disk or external hard disk) access crashing issue fixed.
• Sound is working inside Virtual machine, Bravoo……
• 5 Screen resolution sizes can be adjusted
• Shared folders between Mac OS X guest and Windows host for data sharing

What’s You Need?

1)Snow Leopard retail DVD – More information available on how to Rip the DVD to ISO format if you face any issues.

2) Hardware Virtualization Technology (VT) Enabled Computer in BIOS – Read this guide how to enable Virtualization Technology (VT) in BIOS and Confirm.

3) Latest VirtualBox and Its extension pack, as of today VirtualBox 4.0.4 is the latest. Read more here about extension pack installation and download

4) Bit patient to read this full guide and other several guides I point out.

My Demonstration PC

Intel Core2Duo 2.66GHz, 3GB RAM, Intel P35 chipset with Windows 7 32Bit Host OS.

Since I don’t have other processor computers, I can’t guarantee this guide for all types of processors, but I’m sure this will work on most of the Intel processor computers, AMD users must be lucky with this method, but it’s possible too.

Step by Step Guide for Hackintosh 10.6.7 Snow Leopard on VirtualBox 4

1) Create a new virtual machine with Operating System type – Mac OS X and Version Mac OS X Server.

2) Configure RAM size (Minimum 1GB, Recommended 2GB) and Create new hard disk (20GB will be enough, but you can assign more).

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3) Go to the newly created virtual machine’s settings and adjust the System settings as shown below.

The things you must check here,

1. Floppy drive removed.
2. Chipset selected to ‘ICH9’ (New chipset supported from VirtualBox 4 versions)
3. Enable IO APIC, Enable EFI (This is the built in Boot loader for Mac OS X)

4) You can go to Display and adjust the maximum settings. To be honest, I don’t know how this will improve the video performance inside Mac VM, just hoping…..

5) Go to storage option and mount the ISO file or select the host DVD drive here.

If you want to install with Snow Leopard original retail DVD (Get it here) by inserting into host drive, select the Host drive option and make sure Passthrough is enabled as shown below.

6) Go to USB options and make sure ‘Enable USB Controller’ and ‘Enable USB 2.0 (EHCI) Controller’ selected.

Check the sound option and confirm ‘Windows DirectSound’ and ‘Intel HD Audio’ options are selected. Intel HD Audio is the new virtual audio controller added with VirtualBox 4 and later versions, this driver works inside Snow Leopard virtual machine.

7) Check the installed VirtualBox extension pack on host computer. Extension pack should be installed to support USB2.0 in Snow Leopard VM, if not you will get crashing screen while trying to access USB storage.

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8.) Now go to virtual machine’s folder ( C:UsersUser-NameVirtualBox VMsVirtual-Machine-Name) and open the .vbox file in word processing software like MS WordPad.

9) Enter the following string in the location mentioned in example file.

<ExtraDataItem name=”VBoxInternal2/SmcDeviceKey” value=”ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc”/>

Here is the example file of working Snow Leopard in VirtualBox 4.

The above extra string helps in several ways to install Snow Leopard in VirtualBox 4.

1. Original Vanilla kernel installation with original retail DVD
2. VirtualBox built in EFI boot loader works here. So, you do not need any third party boot loaders.
3. Shutdown and restart of VM works (no hanging screen)
4. ‘About the Mac’ screen works inside snow leopard virtual machine.

10) Power on the virtual machine now. Installation must start normally without any issues. Follow more installation steps and how to create partition during the installation in this guide.

Complete the initial setups and configurations. I’m sure you will land on working Snow Leopard desktop in VirtualBox 4.

Some Post Installation Setups and Configurations on Snow Leopard 10.6.7 on VirtualBox 4

1) Network, USB Access inside virtual machine

NAT and Bridged networking modes worked straightaway inside virtual machine.

USB storage access such as Flash disk and external hard disk worked fine without any issues.

Important Note – You must install VirtualBox Extension Pack before access USB

2) Sound

That’s a really great news for hackintosh users in Oracle VirtualBox. New VirtualBox 4 and latest versions’ new motherboard and sound chipset support sound in Snow Leopard. I can hear 90% clear and unbreakable sound from VM.

Double check the main chipset type under System was set to ICH9 and Audio Controller set to Intel HD Audio as shown above. I’m not sure how this will work in AMD based computers.

3) Screen Resolution Sizes

Since we do not have proper VirtualBox guest additions tools for Mac OS X, we have to use manual methods to modify screen resolution size to 5 options.

Check the below guide and user comments to find out the correct working method for you.

4) Latest 10.6.7 Update

It worked fine. Because of this is purely running from original vanilla kernel without any hacked versions, the update (software or manual) to 10.6.7 installed well.

Just check this guide where to download combo and separate Snow Leopard 10.6.7 update and run the installation.

Take a snapshot before run the update.

5) Shared Folders in Snow Leopard Virtual machine and Windows 7 host

Though, VirtualBox shared folders can’t be used here without guest additions tools, we can use normal file sharing between Mac OS X and Windows by setting up network. You can share large amount of data by this step.

More information available here to setup shared folders in Mac OS X and Windows 7

I hope this guide will be useful in running latest Hackintosh 10.6.7 Mac OS X Snow Leopard on VirtualBox 4 for testing and learning purposes.

You can’t expect the all full features as running on physical Apple hardware, but still its useful for experiment purpose with your normal PC.

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You can download free eBook from Sysprobs for more useful installation methods, tips and tricks on Hackintosh on desktop virtualization software VMware and VirtualBox.

Feel free to drop some comments, success and failure installation attempts, I will be happy to help you.

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Have fun.