Hi Pelleplutt, Diags.exe of proadmin.exe package - https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=4237&lang=eng can show the mac address w/out going to the windows system.
1. copy the Diags.exe to your USB boot disk
2. run Diags.exe and click "View Adapter configuration".
I've tried it on older version of Intel cards but not on this model. You may want to try it out.
hope this helps.