Logic Board - 27" Apple iMac A1312 Mid 2011 *No CPU*

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Replacement Logic Board for the 27" Apple iMac A1312 Mid 2011

Part Numbers 820-2828 639-2289

This Logic Board was used in all configurations of 27" Mid 2011 iMacs.

CPU is Not Included

Apple 27" iMac Mid 2011 

Identifiers: Mid 2011 - iMac 12,2 - A1312-2429

Model Numbers





Socket LGA1155

supported CPU's i5-2500s i5-2400 i7-2600


4 available slots utilizing 1333MHz DDR3 memory

Graphics Options

  • AMD Radeon HD 6770M graphics processor with 512MB of GDDR5 memory
  • AMD Radeon HD 6970M graphics processor with 1GB of GDDR5 memory
  • AMD Radeon HD 6970M graphics processor with 2GB of GDDR5 memory

Video Support and Camera

  • FaceTime HD camera
  • Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display
  • Support for extended desktop and video mirroring modes

Connections and Expansion

  • Two Thunderbolt ports
  • Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
  • One FireWire 800 port; 7 watts
  • Four USB 2.0 ports
  • SDXC card slot
  • Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)
  • Audio in/out
  • 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
  • IR receiver

All our products are covered by our own 60 day warranty.  If a problem arises we want to work through the situation with you.  Happy customers are the way we continue to grow and we are here to help.

Our Process 

  • Identify the problem by assisting with a diagnoses and trouble shooting.
  • Determine the best way to resolve the issue.  Our preferred method is to replace the defective item whenever possible.
  • We do ask to share the cost of shipping, we will pay for outbound shipping and ask our customers to cover inbound shipping costs
  • If we cannot send a replacement we will issue a refund for the original purchase price less any shipping costs.