iMac · 2011 – 2012

iMac (21.5-inch, Mid 2011)

Model A1311 EMC 2428 iMac12,1

Last update: macOS 10.13 High Sierra

Specifications

Released: 3 May 2011
Discontinued: 23 Oct 2012
Processor: Intel Core i5-2400S (Sandy Bridge, quad-core), 2.5 GHz
Architecture: Intel (64-bit)
Graphics: Radeon HD 6750M (512 MB)
Memory: 4 GB (up to 32 GB)
Storage: 500GB HDD
Display: 21.5-inch, 1920 × 1080
Shipped with: Mac OS X 10.6.6
Newest macOS: macOS 10.13 High Sierra
Launch price: $1,199 (US, base model)

Base configuration at launch. Built-to-order Macs can have a faster chip, more memory or more storage.

Numbers printed on this Mac

Number	What it is
A1311	Model number, on the underside or the back
EMC 2428	EMC number	Reported
iMac12,1	Model identifier, in System Information

Configurations

iMac "Core i5" 2.5 21.5" (Mid-2011)

2.5 GHz Core i5 (I5-2400S)

Order number: MC309LL/A
Model number: A1311 · EMC 2428
Identifier: iMac12,1
Memory: 4 GB
Graphics memory: 512 MB
Storage: 500 GB HDD
Optical drive: 8X DL "SuperDrive"
Sold: 3 May 2011 – 23 Oct 2012

iMac "Core i5" 2.7 21.5" (Mid-2011)

2.7 GHz Core i5 (I5-2500S)

Order number: MC812LL/A
Model number: A1311 · EMC 2428
Identifier: iMac12,1
Memory: 4 GB
Graphics memory: 512 MB
Storage: 1 TB HDD
Optical drive: 8X DL "SuperDrive"
Sold: 3 May 2011 – 23 Oct 2012