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The difference between Mid 2011 21.5' and 27' concerning CPU upgradability is mainly caused by the available power from the power supply.- The 21.5' has 210W power supply, the 27' has 310W. As the power is shared among the components, it is recommended to- either use a CPU with TDP of 65W (or close to this) only for the 21.5'. The Intel-based iMac is a series of Macintosh desktop computers designed, manufactured and sold by Apple Inc. It is a member of the iMac family. It is one of four desktop computers in the current Macintosh lineup, serving as an all-in-one alternative to the Mac Mini, and sits below the performance range iMac Pro and Mac Pro. Macs generally will not run an older Mac OS X operating system than shipped with them. The one exception is virtualizing 10.6 Server on 10.7 or later, which is described later. Also important to note is that the Apple App Store only has 10.7, 10.8, and 10.12, except for those who purchased in between systems, and have a Mac that shipped with in. AppleCare+ for Mac Every Mac comes with a one-year limited warranty and up to 90 days of complimentary technical support.AppleCare+ for Mac extends your coverage to three years from your AppleCare+ purchase date and adds up to two incidents of accidental damage protection every 12 months, each subject to a service fee of $99 for screen damage or external enclosure damage, or $299 for other.

Aluminum iMac Q&A - Updated July 15, 2016

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How do you upgrade the hard drive in the 'Original/Mid-2007,' 'Early 2008,' 'Early 2009' and 'Mid-2009' (20-Inch and 24-Inch) Aluminum iMac models? What type of hard drive do they support? Can you swap the hard drive for an SSD?

Please note that this Q&A covers Aluminum iMac models with 20-Inch and 24-Inch displays. EveryMac.com also provides instructions to upgrade the hard drive and SSD storage in more recent 'Flat Edge' 21.5-Inch and 27-Inch aluminum models as well as the latest 'Tapered Edge' 21.5-Inch and 27-Inch aluminum line.

The 'Original/Mid-2007,' 'Early 2008,' 'Early 2009' and 'Mid-2009' Aluminum iMac models -- all Aluminum iMacs with a 20-Inch or 24-Inch display -- each have a 3 Gb/s SATA connector for a 3.5' hard drive and different models have a variety of different hard drives installed by default.

Photo Credit: Apple, Inc. (20-Inch & 24-Inch Aluminum iMac)

How To Replace Hard Drive Imac 27 Mid 2011

Apple considers the memory in these models to be a 'customer installable part' but the hard drive is not intended to be upgraded by end users. Upgrading the memory is extremely easy -- there is a small removable 'door' on the bottom of each system for this purpose -- but upgrading the hard drive requires one to remove the display and effectively disassemble the entire computer.

Disasembling the computer is not simple, but the hard drive in these models also can be swapped out with a faster 3 Gb/s SATA-equipped SSD, and the swap is no more difficult than upgrading the hard drive.

Identification Help

All of the 20-Inch and 24-Inch Aluminum iMac models have the same hard drive support. However, specific upgrade instructions are a bit different -- particularly for 20-Inch models -- so it still is important to be able to identify your iMac precisely.

These models can be most readily identified in software by Model Identifier as well as externally via EMC number (located inconveniently under the 'foot' supporting the computer).

To locate the Model Identifier in software, select 'About This Mac' under the Apple Menu on your computer and click the 'More Info...' button. If the iMac is running OS X 10.7 'Lion' or later, you will need to click the 'System Report' button after clicking 'More Info...' as well. As always, EveryMac.com has carefully hand documented each EMC number and model identifier for your convenience.

These identifiers for each of the 20-Inch and 24-Inch iMac models follow:

EveryMac.com's Ultimate Mac Lookup feature -- as well as the EveryMac app -- also can uniquely identify these models by their Serial Number, which is listed on the underside of the foot along with the EMC number and within the operating system alongside the model identifier. More details about specific identifiers are provided in EveryMac.com's extensive Mac Identification section.

Hard Drive or SSD Upgrade Instructions

For adventurous -- and highly skilled -- users interested in replacing or upgrading the hard drive in 20-Inch or 24-Inch models themselves, site sponsor Other World Computing provides helpful step-by-step video instructions of the complex procedure:

Imac 27 Mid 2011 Os X

20' Original/Mid-2007 & Early 2008 iMac Hard Drive Upgrade Video

20' Early 2009 and Mid-2009 iMac Hard Drive Upgrade Video

24' Original/Mid-2007 through Early 2009 iMac Hard Drive Upgrade Video

From watching the videos, it should be clear that upgrading the hard drive or SSD in these models is complicated. If you do not feel comfortable -- or have the time -- to perform the upgrade yourself, it always is a good idea to hire a professional.

What Is The Latest Os For Imac Mid 2011

iMac Storage Purchase & Professional Installation Options

Quality storage is important. Be sure to buy from a quality vendor that sells storage with a reputation for reliability.

In the US (and many other countries), site sponsor Other World Computing sells SSDs for all iMac models (as well as hard drives) for do-it-yourself upgrades.

In the UK and Ireland, site sponsor Flexx sells Aluminum iMac compatible SSDs and hard drives with free shipping. The company provides flat rate shipping to France, Germany, and Switzerland and inexpensive shipping for all of Europe, too.

In Australia, site sponsors Macfixit and Upgradeable sell iMac compatible hard drives and SSDs with fast shipping, a money-back guarantee and more.

In New Zealand, site sponsor Upgradeable New Zealand sells iMac hard drives and SSDs with fast delivery to all corners of the country, precise compatibility, a lifetime warranty, and a money-back guarantee.

Also see:

Imac (27-inch Mid 2011) Latest Os

• How do you upgrade the hard drive in the 'Late 2009,' 'Mid-2010,' 'Mid-2011' and 'Late 2011' (21.5-Inch and 27-Inch) Aluminum iMac models? What type of storage do they support? Is it even possible to upgrade these models?
• How do you upgrade the hard drive in the 'Tapered Edge' Aluminum iMac models? What type of storage do they support? Is it possible to upgrade the hard drive or SSD?

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