076-00012 A1398 Bottom Case Housing Discrete GPU for 15inch Macbook Pro Retina Mid 2014 NB-5231W This a replacement bottom case for the MacBook Pro 15" Retina released in Mid 2014. There are two models of bottom cases for this model. One is for models that came with Integrated Graphics (IG) and one for Discrete Graphics (DG). Be aware which model you have when ordering. Apple part number: 076-00012
Compatible models: Macbook Pro (Retina 15-inch Mid 2014), A1398