OS X 10.8 Mountain Lion System Requirements & Specs

OS X 10.8 Mountain Lion is the ninth major release of Apple’s Mac operating system, and its system requirements define which Macs can run it and what you need to install it. You need a Mac from a supported model list, at least 2 GB of RAM, and about 8 GB of free disk space, and the installer is downloaded through the Mac App Store. This article covers the full system requirements, compatible Macs, installation steps, and common issues.

Background: What Is OS X 10.8 Mountain Lion?

Mountain Lion was announced by Apple on February 16, 2012, and released on July 25, 2012. It was the second version of OS X to be distributed digitally through the Mac App Store, following OS X 10.7 Lion. The name continued Apple’s shift from big cats (Lion) to California landmarks, with Mountain Lion being the last cat-themed release before OS X 10.9 Mavericks.

Key features introduced in Mountain Lion included:

• Notification Center – a slide-out panel for alerts, similar to iOS.
• Messages – replaced iChat, integrating iMessage.
• Game Center – Apple’s social gaming network.
• AirPlay Mirroring – wirelessly send your Mac’s display to an Apple TV.
• Dictation – voice-to-text input.
• Notes and Reminders – standalone apps synced with iCloud.
• Gatekeeper – security feature controlling app downloads.
• Share Sheets – built-in sharing to Twitter, email, and more.

Mountain Lion was a free upgrade for users of Snow Leopard (10.6) or Lion (10.7), a departure from the paid upgrades of previous versions. It was the last version of OS X to support 32-bit Macs (the 2006–2007 Core Duo models), and it dropped support for some older Macs that ran Lion.

Official System Requirements

Apple’s official system requirements for Mountain Lion are:

• Supported Mac models – see the list below.
• OS X version – Snow Leopard (10.6.8) or later, or Lion (10.7).
• RAM – at least 2 GB of memory.
• Storage – 8 GB of available disk space.
• Internet – a connection to download the installer from the Mac App Store.
• Apple ID – required to purchase (or get free) the upgrade.

Some features have additional requirements:

• AirPlay Mirroring – requires a Mac with a 2nd-generation Intel Core i3/i5/i7 or better, and an Apple TV (2nd generation or later).
• Dictation – requires a microphone and a 1.6 GHz or faster processor.
• Power Nap – only on MacBook Air (mid-2011 or later) and MacBook Pro with Retina display.
• Gatekeeper – works on all supported Macs, but requires a Mac with a 64-bit processor (all supported models are 64-bit).

Supported Mac Models

Mountain Lion supports the following Mac models (as listed by Apple):

• iMac – mid-2007 or newer (iMac7,1 and later).
• MacBook – late 2008 (aluminum) or early 2009 (plastic) or newer.
• MacBook Pro – mid-2007 or newer (15-inch and 17-inch), and late 2008 or newer for 13-inch.
• MacBook Air – late 2008 (original) or newer.
• Mac mini – early 2009 or newer.
• Mac Pro – early 2008 or newer.
• Xserve – early 2009.

Notably, the following Macs that ran Lion are not supported by Mountain Lion:

• iMac (mid-2006 and late 2006)
• MacBook (late 2006, mid 2007, late 2007, early 2008)
• MacBook Pro (15-inch and 17-inch, late 2006 and mid-2007)
• Mac mini (late 2006 and mid 2007)
• Mac Pro (2006 and 2007)

If you have one of those models, you cannot install Mountain Lion without third-party patching tools (not recommended).

How to Install Mountain Lion

If your Mac is supported and you have the required OS version, installation is straightforward:

1. Ensure your Mac is running OS X 10.6.8 or later. If not, update to Snow Leopard 10.6.8 first (via Software Update).
2. Open the Mac App Store (if on Snow Leopard, you may need to download it first from Apple’s website).
3. Search for “OS X Mountain Lion� and click the download button. The installer is about 4 GB.
4. Once downloaded, the installer will launch automatically. Follow the on-screen instructions.
5. Agree to the license, choose your startup disk, and click Install. Your Mac will restart and complete the installation.

If you want to create a bootable USB installer (useful for multiple Macs or a clean install), you can use the createinstallmedia command in Terminal after downloading the installer, but that’s an advanced step.

Common Problems and Fixes

Users often encounter a few issues when installing or using Mountain Lion:

• “This version of Mac OS X is not supportedâ€� – Your Mac model is not on the supported list. You may need to stick with Lion or use a patcher (not recommended).
• Installer won’t download – If the Mac App Store is not working on an older OS, you may need to download the installer from a different source (e.g., Apple’s support page) or update to 10.6.8 first.
• Slow performance after upgrade – Mountain Lion can be sluggish on Macs with only 2 GB of RAM. Upgrading to 4 GB or more helps.
• Wi-Fi issues – Some users report Wi-Fi drops after upgrading. Resetting the SMC and PRAM often helps, and updating to 10.8.5 (the final version) fixes many bugs.
• Compatibility with older apps – Mountain Lion dropped support for PowerPC apps (via Rosetta, which was removed in Lion) and some older 32-bit apps may not run. Check for updates or use a virtual machine.

Comparison: Mountain Lion vs. Lion and Mavericks

Mountain Lion sits between Lion (10.7) and Mavericks (10.9). Here’s how they compare:

• Lion – introduced the Mac App Store, Launchpad, Mission Control, and full-screen apps. Mountain Lion refined these and added iOS features like Notification Center and Messages.
• Mavericks – released in October 2013, Mavericks was a free upgrade that focused on performance and battery life, added iBooks, Maps, and improved multi-display support. It dropped support for some older Macs (e.g., MacBook Pro mid-2007).

If you’re deciding whether to upgrade from Lion, Mountain Lion is a worthwhile improvement. If you’re on Mountain Lion and considering Mavericks, it’s also free and generally more stable, but check if your Mac is supported (Mavericks requires a Mac from mid-2007 or later, but some older models are excluded).

Cost and Availability

Mountain Lion was available for $19.99 (USD) when released, but Apple later made it free for users of Snow Leopard and Lion. As of 2023, the installer is no longer available from the Mac App Store, but you can download it from Apple’s support website if you have an Apple ID that previously purchased it. Otherwise, you may need to find the installer elsewhere, but be cautious of unofficial sources.

If you’re looking to run Mountain Lion on a modern Mac (e.g., a 2019 MacBook Pro), it’s not officially supported, and you’d need to use a virtual machine (like Parallels or VMware) to run it. That’s possible but requires a licensed copy of the OS.

Frequently Asked Questions

Can I install Mountain Lion on an unsupported Mac?

Technically, yes, with third-party patchers like the “Mountain Lion Patcher� that modify the installer to run on older Macs. However, this is not recommended because it can lead to instability, missing drivers, and security issues. Apple does not provide support for such installations.

Is Mountain Lion still safe to use?

No. Apple stopped providing security updates for Mountain Lion in 2015. Using it on the internet today exposes you to unpatched vulnerabilities. If you must use it, avoid sensitive activities like online banking, and consider using a firewall and ad-blocker.

How much RAM does Mountain Lion need?

Apple’s minimum is 2 GB, but for acceptable performance, 4 GB is recommended. If you have 2 GB, expect slower app switching and occasional beach balls. Upgrading RAM is usually easy on older Macs.

Can I upgrade from Mountain Lion to a newer macOS?

Yes, you can upgrade directly to Mavericks (10.9) or later, but not to versions that require a newer Mac. For example, a mid-2007 iMac can go to Mountain Lion but not to Catalina (10.15) because it lacks a 64-bit EFI. Check the requirements for each version.

Does Mountain Lion support 32-bit apps?

Yes, Mountain Lion supports 32-bit Intel apps, but not PowerPC apps (Rosetta was removed in Lion). Some older 32-bit apps may have issues, but most run fine.

How do I get the Mountain Lion installer now?

If you previously downloaded it, you can find it in the “Purchasedâ€� tab of the Mac App Store (if still available). Otherwise, Apple’s support page may have a direct link, but it’s been removed. You can also search online, but beware of malware – only download from trusted sources.

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