Introduction Date: May 3, 2011 Discontinued Date: October 23, 2012<br> Processors: 1 (4 Cores) Architecture: 64-Bit<br> Geekbench 2 (32): 7241 Geekbench 2 (64): 7970<br> Geekbench 3 (32): 2464 Geekbench 3 (32): 6698<br> Geekbench 3 (64): 2637 Geekbench 3 (64): 7237<br> Processor Speed: 2.5 GHz Processor Type: Core i5 (I5-2400S)<br> 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 3.3 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).<br> <br> Also see: How much faster are the "Mid-2011" Aluminum iMac models than the "Mid-2010" models?<br> Turbo Boost: 3.3 GHz Custom Speeds: N/A<br> Processor Upgrade: LGA 1155 (Socket H2)* FPU: Integrated<br> System Bus Speed: 5 GT/s* Cache Bus Speed: 2.5 GHz (Built-in)<br> ROM/Firmware Type: EFI EFI Architecture: 64-Bit<br> L1 Cache: 32k/32k L2/L3 Cache: 256k (x 4), 6 MB<br> RAM Type: PC3-10600 DDR3 Min. RAM Speed: 1333 MHz<br> Details: Supports 1333 MHz PC3-10600 DDR3 SO-DIMMs (204-pin).<br> <br> Also see: How do you upgrade the RAM in this Aluminum iMac model? How much RAM does it actually support?<br> Standard RAM: 4 GB Maximum RAM: 32 GB*<br> Details: By default, 4 GB of RAM is installed as two 2 GB SO-DIMM modules. Two slots free.<br> <br> *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.<br> <br> In the US (and many other countries), site sponsor Other World Computing sells memory -- as well as other upgrades -- for this iMac.<br> <br> In Canada, site sponsor The Mac Market sells memory and other upgrades for this iMac.<br> <br> In Australia, site sponsor RamCity sells memory and other upgrades for this iMac.<br> <br> In Southeast Asia, site sponsor SimplyMac.sg sells memory and other upgrades for this iMac.<br> <br> Also see: Actual Max RAM of All G3 & Later Macs.<br> Motherboard RAM: None RAM Slots: 4<br> Video Card: Radeon HD 6750M VRAM Type: GDDR5<br> Details: This model has an AMD Radeon HD 6750M graphics processor with 512 MB of dedicated GDDR5 memory. <br> Also see: What type of video processor is provided by the Aluminum iMac systems? Is it upgradable?<br> Standard VRAM: 512 MB Maximum VRAM: 512 MB<br> Built-in Display: 21.5" 16:9 Widescreen Native Resolution: 1920x1080<br> Details: This model has a 21.5" glossy LED-backlit 16:9 widescreen TFT active matrix display with "IPS technology" and a native resolution of 1920x1080. Apple also reports a viewing angle of 178 degrees horizontal and 178 degrees vertical. The contrast ratio is 1000:1.<br> <br> Site sponsor MicroReplay provides display replacement as well as advanced repair services like liquid spill recovery, logic board repair, accident and abuse repair, and more for this iMac.<br> 2nd Display Support: Dual/Mirroring 2nd Max. Resolution: 2560x1600<br> Details: Apple reports that this model simultaneously supports the native resolution of the built-in display and up-to a 30-inch external display (2560x1600).<br> Standard Hard Drive: 500 GB (7200 RPM) Int. HD Interface: Serial ATA (6 Gb/s*)<br> Details: *As shipped, these models only supported the 3 Gb/s Serial ATA 2.0 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 Serial ATA 3.0 support.<br> <br> 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?<br> <br> Site sponsor Other World Computing sells storage upgrades for this iMac.<br> <br> Site sponsor Mission Repair offers professional storage installation and other services in 24 hours for this iMac.<br> Standard Optical: 8X DL "SuperDrive" Standard Disk: None<br> Standard Modem: None Standard Ethernet: 10/100/1000Base-T<br> Details: N/A<br> Standard AirPort: 802.11a/b/g/n (450 Mbit*) Standard Bluetooth: 2.1+EDR<br> USB Ports: 4 (2.0) Firewire Ports: 1 (800)<br> Expansion Slots: SDXC SD Card Expansion Bays: None<br> Details: N/A<br> Incl. Keyboard: Apple Wireless Keyboard Incl. Input: Magic Mouse/Trackpad<br> Case Type: All-in-One Form Factor: iMac (Late 2009)<br> Apple Order No: MC309LL/A Apple Subfamily: Mid-2011<br> Apple Model No: A1311 (EMC 2428) Model ID: iMac12,1<br> Details: Please note that these identifiers refer to more than one model.<br> <br> Also see: All Macs with the A1311 Model Number, the 2428 EMC Number, and the iMac12,1 Model Identifier. <br> For more about these identifiers and how to locate them on each Mac, please refer to EveryMac.com's Mac Identification section. Battery Type: N/A Battery Life: N/A<br> Pre-Installed MacOS: X 10.6.6 (10J4026) Maximum MacOS: Current*<br> Minimum Windows: 7 (32-Bit)* Maximum Windows: 8 (64-Bit)*<br> MacOS 9 Support: None Windows Support: Boot/Virtualization<br>