You saw an unknown device in Device Manager, right?
Right click on it, open Properties, Details tab, and in the drop down list select HardwareIDs, and look at the results carefully. It will look something like this: PCI\VEN_8086&DEV_4220&SUBSYS_27018086&REV_05
Now go to http://www.pcidatabase.com/, and use the four number characters following VEN for Vendor, and another four number characters following DEV for Device, to identify your hardware.