Intel SSB temperature sensor
That would be "server south bridge", according to Intel: https://www.intel.com/content/dam/support/us/en/documents/motherboards/server/sb/s2600xxv3_errata_02242015_final.pdf (search for SSB)
That would be "server south bridge", according to Intel: https://www.intel.com/content/dam/support/us/en/documents/motherboards/server/sb/s2600xxv3_errata_02242015_final.pdf (search for SSB)