Identify your hardware by serial number:
FCC ID
MAC ID (OUI)
PCI vendor ID
PnP vendor ID
MCA device ID
BIOS ID

CPU
CPU ID
CPU S-spec (intel only)

chip
PCI ID
JEDEC manufacturer ID (SPD EEPROM)
Chip S-spec (intel only)

Related information
What is a CPU ID
What is a PCI ID