Apple Computer, MacBook Pro 15-inch (Dual Graphics) 2.0/2.3/2.6 GHz Core i7 (i7-4750, i7-4850HQ, i7-4960HQ),
Compatible Order Number, ME294LL/A, BTO/CTO,
Compatible Model Number, A1398,
Model Year, Late 2013,
Part Name, Logic Board 2.3 GHz (16GB),
Manufacture Part Number, 820-3787-A,
EMC Number, EMC 2683,
EEE Code, FP52, FP58, FP5C,
Compatible Apple Computer, MacBook Pro - DG (15-inch, Late 2013)
Order you product here:
661-8303 Logic Board 2.3 GHz (16GB) for MacBook Pro 15-inch Late 2013 A1398 ME294LL/A, BTO/CTO (820-3787-A),
661-8303
source
http://info.applepartsellers.com/661-8303-logic-board-2-3-ghz-16gb-for-macbook-pro-15-inch-late-2013-a1398-me294ll-a-bto-cto-820-3787-a