Apple Computer, iMac 27-inch 3.2/3.4 GHz Core i5 (i5-4570, i5-4670), iMac 27-inch 3.5 GHz Core i7 (i7-4771), Compatible Order Number, ME088LL/A, ME089LL/A, MF125LL/A, Compatible Model Number, A1419, Model Year, Late 2013, Part Name, Logic Board 3.4 GHz (2GB), Manufacture Part Number, 820-3481-A, EMC Number, EMC 2639, EEE Code, FC3F, FC3J, Compatible Apple Computer, iMac (27-inch, Late 2013)
Order you product here: 661-7517 Logic Board 3.4 GHz (2GB) for iMac 27-inch Late 2013 A1419 ME088LL/A, ME089LL/A, MF125LL/A (820-3481-A), 661-7517
source http://info.applepartsellers.com/661-7517-logic-board-3-4-ghz-2gb-for-imac-27-inch-late-2013-a1419-me088ll-a-me089ll-a-mf125ll-a-820-3481-a