Apple iMac 27 Inch A1312 2011 Socket Lga1155 Logic Board Motherboard 820-2828-a for sale online | eBay
Original A1312 Motherboard For iMac 27'' Late 2009 Mid 2010 2011 Logic Board System 2 in 1 PC Replacement Full Tested Mainboard|Computer Cables & Connectors| - AliExpress
Original A1312 Motherboard For Apple Imac 27" A1312 Logic Board 820-2507-a 820-2733-a 820-2901-a 820-2828-a 2009 2010 2011 Year - Laptop Motherboard - AliExpress
Apple iMac 27” Mid 2011 A1312 MC813LL/A MC814LL/A Logic Board 820-2828 - NO CPU | eBay