Apple iMac MC309LL/A 21.5" Core i5 2.7GHz 4GB RAM 1TB A1311 Mid-2011 OS X

Apple iMac MC309LL/A 21.5" Core i5 2.7GHz 4GB RAM 1TB A1311 Mid-2011 OS X

The Apple iMac MC309LL/A is a Mid-2011 21.5-inch all-in-one desktop computer built around a 2.7 GHz Intel Core i5-2500S quad-core processor. It integrates display, computer, and speakers into a single slim aluminum enclosure. This unit has been powered on and is running a fresh install of OS X 10.10 Yosemite; the maximum supported operating system for this model is macOS 10.13 High Sierra.

Specifications & What's Included

• Model: MC309LL/A — also known as A1311 (EMC 2428)
• Model Identifier: iMac12,1
• Introduced: May 3, 2011 — Discontinued: October 23, 2012
• Processor: 2.7 GHz Intel Core i5 (i5-2500S), quad-core
• RAM: 4 GB DDR3 1333 MHz (2x 2 GB modules installed; 4 slots total, 2 open for upgrade)
• Maximum RAM: 16 GB
• Storage: 1 TB SATA hard drive (approx. 990 GB free as photographed)
• Graphics: AMD Radeon HD 6770M with 512 MB VRAM
• Built-in Display: 21.5-inch IPS, 1920 x 1080 resolution
• Optical Drive: 8x DL SuperDrive — supports CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-R DL, DVD+R DL
• Operating System Installed: OS X 10.10 Yosemite (fresh install)
• Maximum Supported OS: macOS 10.13 High Sierra
• Power: 100–240V~, 50–60 Hz, 4.0A
• Includes: Generic power cord
• Does NOT include: Keyboard or mouse

Applications

The Mid-2011 iMac was Apple's mainstream all-in-one desktop for home, education, and small business use during that era. The Sandy Bridge-generation Core i5-2500S gives it enough headroom for general office work, web browsing, light photo and video editing, and everyday productivity tasks. Because the maximum supported OS is High Sierra (10.13), it is compatible with a wide range of legacy Mac software and can still run many productivity suites, creative applications, and developer tools that target that OS generation. These machines are commonly sought for use as secondary desktops, point-of-sale or kiosk systems, classroom computers, and light creative workstations where the tight integration of display and computer in one enclosure is a practical advantage. The two open RAM slots make upgrading to 8 or 16 GB straightforward, and the SATA drive bay can accept a larger HDD or an SSD for a noticeable performance boost.