Can you install Windows 10 on a server?

Yes, Windows 10 can be installed on a server machine. However, you also have to consider that you can fully utilize the capacity of the Windows server operating system with the specification that you have provided.

Can I run Windows 10 on a server motherboard?

You could still install 32 bit Windows 10. There is also a software block on Xeons. Windows 10 Home will not install on Xeon class machines. Xeons are considered Enterprise class hardware and require the Professional or Enterprise editions of Windows 10.