Correct me if I’m wrong, but Windows doesn’t really have anything quite like the System Information app on macOS.

If you’ve got an HP server however, you can get some fairly detailed information about the configuration of the server as it shipped from HP without needing to inspect it physically.

First, find the serial number of the machine. Open up a CMD window and enter the following:

wmic bios get serialnumber

This will return something like

SerialNumber
CN123456AB

Take this serial number and enter it into the HP PartSurfer website at http://partsurfer.hp.com/search.aspx

From this, you should be able to get at least the model number, CPU type and base RAM specifications.