I would also like to know whether the onboard ethernet is really wired up? It identifies as 14e4:16a3 "Broadcom Corporation Device 16a3 (rev 21)". I do not think it is used in the Thunderbolt ethernet adaptor, since the thunderbolt adaptor has its own onboard BCM57762 ethernet controller. So what is the point of including ethernet in the Macbook itself? Can it be used?