SOUTHERNINTL Repalcement For HP EliteBook 745 840 848 G3 G4 Heatsink With Cooling Fan P/N: EG50050S1C710S9A 821163001 Same laptops model heatsink have different part number, and for different GPU&CPU chips, plz confirm your heatsink P/N and let us know when you ordering Note: Prior to purchase, please review all photos and description details to ensure this item suits your needs and is compatible with your system.