Follow the below steps to know How To Find Out What Motherboard I Have on Mac
About This Mac
Click the Apple menu () now click on About This Mac and find the option More Info.
System Information
Go to Apple menu > About This Mac > System Report > Hardware Overview.
FInd out "Board ID" or "Logic Board" number.
Terminal Command
Open Terminal and type the command prompt:
system_profiler SPHardwareDataType | grep "Board ID"
This will display your Mac’s logic board identifier.