Hi @floridaidoctor
There are a few different Surface Pro 9 models.
A lot of the major components in a Surface Pro 9 laptop are hard mounted on the motherboard and are not replaceable, e.g. CPU, ram, 5G wireless capability Y/N? etc therefore the specifications for your particular laptop are required to know which motherboard is needed
Here's a link that shows the specifications for the different variants (click on tech specs)
Here's the Surface Pro 9 English Service Guide that may help if you wish to open the laptop to check which board you have and/or to replace it
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