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Apple iMac 27-Inch 'Core i5' 2.7 (Mid-2011) Specs
Identifiers: Mid-2011 - MC813LL/A - iMac12,2 - A1312 - 2429
All iMac 27-Inch Models | All 2011 Models | Dynamically Compare This Mac to Others
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The iMac 'Core i5' 2.7 27-Inch Aluminum (Mid-2011) is powered by a Quad Core 2.7 GHz Intel 'Core i5' I5-2500S (Sandy Bridge) processor with a dedicated 256k level 2 cache for each core and a 6 MB shared level 3 cache. In lieu of a system bus, it has a 'Direct Media Interface' (DMI) that 'connects between the processor and chipset' at 5 GT/s.
By default, it is configured with 4 GB of RAM (1333 MHz PC3-10600 DDR3 SDRAM), a 1 TB (7200 RPM) hard drive, a vertically-mounted slot-loading DVD±R DL 'SuperDrive', and AMD Radeon HD 6770M graphics with 512 MB of dedicated GDDR5 memory.
It also has a built-in 'FaceTime HD' video camera and built-in stereo speakers underneath the 27' glossy 16:9 LED-backlit TFT Active Matrix LCD (2560x1440 native) display 'with IPS technology'.
Connectivity includes four USB 2.0 ports, a Firewire '800' port, built-in AirPort Extreme, Gigabit Ethernet, and an SDXC card slot as well as dual 'Thunderbolt' ports that are backwards compatible with Mini DisplayPort and, likewise, each support an external display up to 30' (2560x1600). Thunderbolt also supports other peripherals that use the Thunderbolt standard which provides up to 10 Gbps of bandwidth in both directions.
Externally, the 'Mid-2011' iMac line uses the same 'edge-to-edge' glass design and 'seamless all aluminum enclosure' as the 'Mid-2010' models that came before them. Internally, however, the 'Mid-2011' line is equipped with faster processors and faster graphics processors, as well as the aforementioned external improvements of a higher resolution (and wider angle) webcam and Thunderbolt.
The 'Mid-2011' iMac models included a compact aluminum Apple Wireless Keyboard and the choice of either a multi-touch 'Magic Mouse' or a multi-touch 'Magic Trackpad' that 'enables users to scroll smoothly up and down a page with inertial scrolling, pinch to zoom in and out, rotate an image with their fingertips and swipe three fingers to flip through a collection of web pages or photos' just like on Apple notebooks from the same era. An aluminum remote was offered for an additional US$19, too.
Also see:
- What are the differences between the 'Mid-2011' Aluminum iMac models?
- How do the 'Mid-2011' Aluminum iMac models compare to the 'Mid-2010' models that preceded them?
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- Tech Specs
- Ports
- Global Original Prices
- Popular Q&As
Click on a category for related details. The most commonly needed info is 'open' by default, but all info is important. Asterisks (*) reference data in details fields.
| Introduction Date: | May 3, 2011 | Discontinued Date: | October 23, 2012 |
| Details: | The 'Introduction Date' refers to the date a model was introduced via press release. The 'Discontinued Date' refers to the date a model either was replaced by a subsequent system or production otherwise ended. Also see: All Macs introduced in 2011. |
| Details: | Also see: All models with a 64-Bit processor courtesy of EveryMac.com's Ultimate Mac Sort. |
| Details: | Geekbench 2 benchmarks are in 32-bit and 64-bit modes, respectively. These numbers reflect an average of user provided 32-bit and 64-bit results as submitted to the Geekbench website. Higher numbers are better. You also might be interested in reviewing all 32-bit and 64-bit Geekbench 2 user submissions for Macs with the iMac12,2 Model Identifier, which may include multiple models. To dynamically compare Geekbench 2 results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison. |
| Details: | These Geekbench 3 benchmarks are in 32-bit mode and are for a single processor core and all processor cores, respectively. Both numbers reflect an average of user provided results as submitted to the Geekbench website. Higher numbers are better. You also might be interested in reviewing all 32-bit single core and multicore Geekbench 3 user submissions for Macs with the iMac12,2 Model Identifier, which may include multiple models. To dynamically compare 32-bit Geekbench 3 results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison. |
| Details: | These Geekbench 3 benchmarks are in 64-bit mode and are for a single processor core and all processor cores, respectively. Both numbers reflect an average of user provided results as submitted to the Geekbench website. Higher numbers are better. You also might be interested in reviewing all 64-bit single core and multicore Geekbench 3 user submissions for Macs with the iMac12,2 Model Identifier, which may include multiple models. To dynamically compare 64-bit Geekbench 3 results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison. |
| Details: | These Geekbench 4 benchmarks are are for a single processor core and all processor cores, respectively. All Geekbench 4 benchmarks are 64-bit. Both numbers reflect an average of user provided results as submitted to the Geekbench website. Higher numbers are better. You also might be interested in reviewing all single core and multicore Geekbench 4 user submissions for Macs with the iMac12,2 Model Identifier, which may include multiple models. To dynamically compare Geekbench 4 results from different Macs side-by-side, see EveryMac.com's Ultimate Mac Comparison. |
| Processor Speed: | 2.7 GHz | Processor Type: | Core i5 (I5-2500S) |
| Details: | This model is powered by a 32 nm, 64-bit Intel Core i5 'Sandy Bridge' processor with quad cores (four independent processor cores on a single silicon chip, each with one thread). Each core has a dedicated 256k level 2 cache and all processor cores share a single 6 MB level 3 cache. It also supports Turbo Boost 2.0 (up to 3.7 GHz) -- which 'automatically boosts the processor speed based on workload' (so if an application is only using one of the four cores it will automatically increase the speed of the core in use and turn off the unused cores). Also see: How much faster are the 'Mid-2011' Aluminum iMac models than the 'Mid-2010' models? |
| Details: | N/A |
| Processor Upgrade: | LGA 1155 (Socket H2)* | FPU: | Integrated |
| Details: | *Officially, Apple provides no information about whether or not the processor in this model can be upgraded and the company does not intend for one to upgrade the processor either. However, this processor supports an LGA 1155 (H2) socket and it is possible to upgrade the processor to some extent. Also see: Is it possible to upgrade the processor in the Aluminum iMac models? |
| System Bus Speed: | 5 GT/s* | Cache Bus Speed: | 2.7 GHz (Built-in) |
| Details: | *This system has a 'Direct Media Interface' (DMI) that 'connects between the processor and chipset' in lieu of a traditional system bus. Intel reports that it runs at 5 GT/s. |
| Details: | N/A |
| Details: | Each core has its own dedicated 256k level 2 cache and the system has 6 MB of shared level 3 cache. |
| Details: | Supports 1333 MHz PC3-10600 DDR3 SO-DIMMs (204-pin). Also see: How do you upgrade the RAM in this Aluminum iMac model? How much RAM does it actually support? |
| Details: | By default, 4 GB of RAM is installed as two 2 GB SO-DIMM modules. Two slots free. *Officially, this model supports four 4 GB modules -- one in each slot for a maximum of 16 GB of memory. However, third-parties have discovered that it actually will support 32 GB of memory using four 8 GB modules. In the US (and many other countries), site sponsor Other World Computing sells memory -- as well as other upgrades -- for this iMac. In the UK, site sponsor Flexx sells memory and other upgrades for this iMac. In Canada, site sponsor CanadaRAM sells RAM and other upgrades for this iMac. In Germany, site sponsor CompuRAM sells memory and other upgrades for this iMac. In Australia, site sponsor RamCity sells memory and other upgrades for this iMac. In Southeast Asia, site sponsor SimplyMac.sg sells memory and other upgrades for this iMac. Also see: Actual Max RAM of All G3 & Later Macs. |
| Details: | N/A |
| Details: | This model has an AMD Radeon HD 6770M graphics processor with 512 MB of dedicated GDDR5 memory. Also see: What type of video processor is provided by the Aluminum iMac systems? Is it upgradable? |
| Details: | This model has 512 MB of dedicated GDDR5 video memory. |
| Built-in Display: | 27' 16:9 Widescreen | Native Resolution: | 2560x1440 |
| Details: | This model has a 27' glossy LED-backlit 16:9 widescreen TFT active matrix display with 'IPS technology' and a native resolution of 2560x1440. Apple also reports a viewing angle of 178 degrees horizontal and 178 degrees vertical. The contrast ratio is 1000:1. |
| 2nd Display Support: | Dual/Mirroring (x2) | 2nd Max. Resolution: | 2560x1600 |
| Details: | Apple reports that this model simultaneously supports the native resolution of the built-in display and up-to two 30-inch external displays (2560x1600) by using both Thunderbolt ports. |
| Standard Storage: | 1 TB HDD | Std. Storage Speed: | 7200 RPM |
| Details: | Also see: How do you upgrade the hard drive in the 'Late 2009,' 'Mid-2010' and 'Mid-2011' Aluminum iMac models? What type of storage do they support? Is it even possible to upgrade these models? In the US (and many other countries), site sponsor Other World Computing sells storage upgrades for this iMac. In the UK, site sponsor Flexx sells storage upgrades for this iMac. In Canada, site sponsor CanadaRAM sells SSDs and other upgrades for this iMac. In Australia, site sponsor RamCity sells storage upgrades for this iMac. In Southeast Asia, site sponsor SimplyMac.sg sells storage upgrades for this iMac. Also see: SSD Compatibility Guide for All G3 & Later Macs. |
| Storage Dimensions: | 3.5' (26.10 mm)/2.5' (7 mm) | Storage Interface: | Serial ATA (6 Gb/s*) |
| Details: | *As shipped, these models only supported the 3 Gb/s SATA II standard for both a 3.5' hard drive and a 2.5' SSD. However, as first discovered by site sponsor OWC, the iMac EFI Update 1.6, released two days later, quietly provided 6 Gb/s SATA III support. |
| Standard Optical: | 8X DL 'SuperDrive' | Standard Disk: | None |
| Details: | Apple reports that the slot-loading 8X 'SuperDrive' with 4X double-layer burning (DVD+R DL/DVD±RW/CD-RW) 'writes DVD+R DL discs at up to 4x speed, writes DVD-R and DVD+R discs at up to 8x speed, writes DVD-RW at up to 6x and DVD+RW discs at up to 8x speed, reads DVDs at up to 8x speed, writes CD-R discs at up to 24x speed, writes CD-RW discs at up to 16x speed, [and] reads CDs at up to 24x speed.' |
| Standard Modem: | None | Standard Ethernet: | 10/100/1000Base-T |
| Standard AirPort: | 802.11a/b/g/n (450 Mbit*) | Standard Bluetooth: | 2.1+EDR |
| Details: | AirPort Extreme (802.11a/b/g/n) and Bluetooth 2.1+EDR standard. Although Apple formally makes no mention of it, as discovered by users, this model unofficially supports 450 Mbit/sec 802.11n Wi-Fi using MIMO. |
| Details: | Four USB 2.0 ports and one Firewire '800' port (7 watts). |
| Details: | *This iMac has an extra 6 Gb/s Serial ATA connector and power for the optional SSD, but if one is not installed at the time the system is purchased the connector cables and mounting bracket are not present. Nevertheless, it is possible to install a 2.5' SSD in addition to the hard drive if an SSD is not installed initially it's just a bit of a 'hack.' In the US (and many other countries), site sponsor Other World Computing sells a wide variety of external expansion options and hand-picked accessories like external storage, stands, keyboards, cables, adapters, speakers, and more for this iMac. In Australia, site sponsor Macfixit offers an extensive selection of external expansion options and accessories like docks, stands, chargers, keyboards, security products, and more for this iMac. |
| Incl. Keyboard: | Apple Wireless Keyboard | Incl. Input: | Magic Mouse/Trackpad |
| Details: | This model shipped with a small aluminum 'ultrathin, compact wireless keyboard' (no numeric keypad) and a choice, at no extra charge, of either the wireless 'Magic Mouse', where the 'entire top is a seamless multi-touch surface' that allows one to 'navigate using intuitive finger gestures' or a wireless 'Magic Trackpad' that provides multi-touch input like on a recent Apple notebook. Also see: How does the 'ultra thin' keyboard provided with the 'Aluminum' iMac models compare to a more traditional desktop keyboard? How does it feel? |
| Details: | The external case used by the 'Mid-2011' iMac models essentially is identical to the one first introduced by the 'Late 2009' line with 'edge-to-edge glass' for the display and a 'seamless all aluminum enclosure.' |
| Details: | The Apple order number should be unique to this system. |
| Details: | Please note that these identifiers refer to more than one model. Also see: All Macs with the A1312 Model Number, the 2429 EMC Number, and the iMac12,2 Model Identifier. For more about these identifiers and how to locate them on each Mac, please refer to EveryMac.com's Mac Identification section. |
| Details: | N/A |
| Pre-Installed MacOS: | X 10.6.6 (10J4026) | Maximum MacOS: | X 10.13.x* |
| Details: | *This system fully supports the last version of OS X 10.8 'Mountain Lion', OS X 10.9 'Mavericks', and OS X 10.11 'Yosemite' except for Power Nap functionality. It also supports the last version of OS X 10.11 'El Capitan' -- including Mac-to-Mac AirDrop and AirPlay Mirroring capability -- but no other advanced features are supported including Metal graphics acceleration. It is capable of running macOS Sierra (10.12) as well, although it does not support the Universal Clipboard, Auto Unlock, or Apple Pay features. Finally, this model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC. It is not compatible with macOS Mojave (10.14) or later versions of the operating system. Additionally, please note that OS X 'Lion' 10.7 and subsequent versions of OS X are not capable of running Mac OS X apps originally written for the PowerPC processor as these operating systems do not support the 'Rosetta' environment. To run PowerPC applications on this Mac, it will be necessary to use Mac OS X 10.6 'Snow Leopard'. Also see: Which Macs are compatible with macOS High Sierra (10.13)? What are the system requirements? Which Macs support HEVC? |
| Minimum Windows: | 7 (32-Bit)* | Maximum Windows: | 8.1 (64-Bit)* |
| Details: | *Apple's Boot Camp 4 supports the 32-bit version of Windows 7 on this model and Boot Camp 5 supports the 64-bit versions of Windows 7 and Windows 8. Earlier versions of Windows are not supported. Although Apple does not support Windows 10 via Boot Camp 5 (officially or otherwise), this system meets Microsoft's hardware requirements and it very well may be possible to boot Windows 10 on this Mac. If you have installed Windows 10 on this system (successfully or unsuccessfully), please share the results of your experiment. Thank you. |
| MacOS 9 Support: | None | Windows Support: | Boot/Virtualization |
| Details: | Also see: Are there any third-party programs to run Mac OS 9/Classic applications on Intel Macs? Site sponsor OHS specializes in heavily upgraded Macs capable of running both Mac OS X and Mac OS 9 applications. For more on running Windows on Intel Macs, please refer to the exhaustive Windows on Mac Q&A. |
| Dimensions: | 20.4 x 25.6 x 8.15 | Avg. Weight: | 30.5 lbs. (13.8 kg) |
| Details: | In inches - height by width by depth, (51.7 cm, 65.0 cm, 20.7 cm). |
| Original Price (US): | US$1699 | Est. Current Retail: | US$900-US$1050 |
| Details: | Please note that on average the estimated current retail pricing of used systems is updated twice a year (please refer to the date on the bottom of the page for the date last updated). Photo Credit: Apple, Inc. |
Click on a category for additional details. The most commonly needed info is 'open' by default, but all info is important. The icons correspond with the icons for each port on the computer.
| Video (Monitor): | 2 (Thunderbolt) | Floppy (Ext.): | None |
| Details: | This model is equipped with two Thunderbolt ports rather than a Mini DisplayPort. Thunderbolt is backwards-compatible with Mini DisplayPort-equipped displays as well as adapters that are compatible with Mini DisplayPort (DVI, VGA, dual-link DVI and HDMI). It also can support other peripherals that use the Thunderbolt standard, which provides a maximum theoretical 10 Gbps of bandwidth in both directions. |
| Details: | N/A |
| Details: | N/A |
| Details: | Four USB 2.0 ports and one Firewire '800' port (7 watts). |
| Details: | No internal modem. Gigabit Ethernet, AirPort Extreme (802.11g/n) and Bluetooth 2.1+EDR standard. |
| Details: | N/A |
| Details: | Single 'audio line in' port. |
| Details: | Single 'audio line out' port also can be used for headphones. |
| Details: | N/A |
| Details: | 100V-240V, 310W maximum for 27-Inch models. |
Global original prices for the iMac 27-Inch 'Core i5' 2.7 (Mid-2011) in 34 different countries and territories follow; organized alphabetically by region.
For global original prices for Intel Macs in one particular country on a single page, please refer to EveryMac.com's Global Original Prices section.
Original Prices - North & South America
| Mexico: | MXN $24,999 | United States: | US$1699 |
Original Prices - Europe
| Denmark: | DKK 12,699 | Finland: | €1679 |
| Ireland: | €1649 | Italy: | €1649 |
| Norway: | NOK 13.490 | Portugal: | €1679 |
| Switzerland: | CHF 1'899 | United Kingdom: | £1399 |
Original Prices - Asia
| India: | Rs 91,900 | Indonesia: | Rp 16,999,000 |
| Malaysia: | RM 5,299 | The Philippines: | PHP 85,990 |
| Thailand: | THB 56,900 | Vietnam: | VND 41,999,000 |
Original Prices - Australia & New Zealand
If you have additional original prices for this model, please get in touch. Thank you.
Ten of the most popular Q&As about the iMac 27-Inch models follow.
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What is SD?
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SD describes devices that conform to SD standards for non-volatile memory cards. See the SD Association website for details.
Are there size limitations for the cards that can be inserted into the SD slot?
Yes. The SD card specification for a memory card is 32mm by 24mm by 2.1mm. You can also use thinner cards, such as MultiMediaCards (MMC). Avoid using cards that have a thickness greater than 2.1mm, as they might damage the SD card slot if you try to insert them.
Which SD card formats work in the SD card slot?
Cards that conform to the SD 1.x, 2.x, and 3.x standards should work. The SD card slot can use:
- Standard SD, 4MB to 2GB
- SDHC (Secure Digital High Capacity), 4GB to 32GB
- SDXC, 4GB to 2TB
- MMC (MultiMediaCards)
- UHS‑II, up to 2TB (iMac Pro only)
You can use a passive adapter like the one shown here to make MiniSD, MicroSD, and higher density formats like MiniSDHC and MicroSDHC conform to the width and thickness specifications listed above:
How fast can my Mac read or write to an SD card in the SD card slot?
Mac notebooks use the USB bus to communicate with the SD card slot. They have a maximum speed of up to 480Mbit/s. Mac desktops use the PCIe bus to communicate with the SD card slot. Desktops can transfer data at a faster rate.
Check the packaging that came with your SD media to determine the maximum transfer rate that your specific card uses.
To determine the maximum transfer speed of your Mac, you can use System Information. Choose Apple () menu > About This Mac and then click System Report.
If you use a Mac notebook:
- Select Hardware, then select USB.
- Select Internal Memory Card Reader and look for the Speed entry.
If you use a Mac desktop computer:
- Select Hardware, then select Card Reader.
- Look for the Link Speed entry. Computers that use the PCIe bus express their speed as GT/s.
Does the SD slot work with cards that exceed 32GB?
Yes. However, most media manufacturers preformat the media using common block-and-cluster sizes that don’t approach the theoretical limits of a given file system.
Most SD cards use the FAT32 file format, and preformatted FAT32 SD media is commonly available up to a capacity of 32GB. Media that exceeds 32GB usually uses the exFAT file system, while some smaller capacity cards use the FAT16 file format. Preformatted FAT16 media is generally available up to a capacity of 2GB.
If you use OS X Snow Leopard 10.6.5 or later, you can find out which file system you’re using:
- Insert the media into the SD card slot.
- Choose Apple menu > About This Mac.
- Click System Report.
- In the Hardware section, click Card Reader, and find the File System field.
Will the SD card slot work with SD cards that use the exFAT file system?
Yes. Any Mac that has an SD card slot and is running OS X 10.6.5 or later can use the exFAT file system.
exFAT is also supported in Boot Camp with Windows 7, 8.1, or 10 on any Mac made in 2011 or later with an SD card slot.
How do I insert media into the SD card slot?
When you insert the card, make sure that the metal contacts face down and point toward the computer. Don’t force media into the SD card slot, as this might cause damage.
How does my Mac use the media inserted into the SD card slot?
Your computer recognizes a card inserted into the SD card slot as a USB storage device. You can mount, read from, and write to the SD card just like you can with any other USB storage device.
I put the card in the slot, but it didn’t mount. What should I do?
Remove the card and insert it again. Sometimes the SD card won’t mount properly if you put it into the slot too slowly.
When I try to write content to the card, I get a 'cannot be modified' message. How can I fix this?
You see this message when you try to edit data on an SD card that’s locked. You need to use the lock slider to unlock the card before you can edit the data.
To eject the card, drag the icon that represents the card to the Trash. After the icon disappears from the desktop, you can remove the card from the computer. Adjust the lock slider tab to unlock the card, then reinsert the card into the slot. See the manufacturer’s instructions for the location of the slider tab.
Can I use Disk Utility to reformat an SD card?
You can use Disk Utility to partition and format an SD device as FAT32 (using the MS-DOS FAT setting) or Mac OS Extended. The Mac OS Extended format can be used only on Macintosh systems. Non-Apple systems won’t recognize cards formatted to Mac OS Extended.
You might have to format a card that’s larger than 32GB with exFAT if you want to use it with a digital camera, GPS, or another device. When in doubt, format the card in the device that you intend to use it with.
Can I install macOS on an SD storage device and use it as a startup volume?
Use Disk Utility to change the default partition table to GUID. Then format the card to use the Mac OS Extended file format.
How do I remove a card from the SD card slot?
Before you remove the card, allow any data transfer to SD media to complete. To eject the card, drag the icon that represents the card to the Trash. After the icon disappears from your desktop, you can remove the card from the slot.
Don't remove a card while your Mac is sleeping, as this could lead to data loss. Always wake your computer and eject the SD card before removing it from your Mac.
Can I use Secure Digital Input Output (SDIO) cards?
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Can I use macOS to see the specifications for the interface hardware and media inserted in the SD card slot?
You can get information about the interface hardware and the media that you inserted in the slot from the System Information:
- Choose Apple menu > About This Mac.
- Click System Report.
- In the Hardware section of System Information, select USB.
- In the list of USB devices, select Internal Memory Card Reader to access information about the interface hardware and the media inserted into the SD card slot.
Can I use the SD card slot while running Windows using Boot Camp?
The SD card slot works with Boot Camp in all supported versions of Windows. You’ll need to download and install the Windows Support Software to use the SD card slot with Windows.
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Learn more about using Windows on a Mac.
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Can I use an SDXC card on my Mac with Windows?
You can use an SDXC card in Windows 7, Windows 8, and Windows 10 with these Mac computers:
- MacBook Pro (Early 2011 and later)
MacBook Pro models from 2016 and later don't have a built-in SD card slot. You can use a USB-C card reader, or a combination of a USB-C to USB Adapter and a USB card reader. - MacBook Air (Mid 2011 and later)
- Mac mini (Mid 2011 and later)
Mac mini (Mid 2010) doesn't support SDXC cards. - iMac (Mid 2011 and later)
iMac (Mid 2010) doesn't support SDXC cards.
Can I use an SD, SDHC, or SDXC card to install Windows on my Mac?
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No. You can’t use SD, SDHC, or SDXC cards with Boot Camp to install Windows software on Mac computers.