I've done a clean install of Windows 8.1 and the previous 1000 mbps speed is now only has 10/100 choices selectable. I'm using an Asus P6X58D motherboard that uses Marvell hard drive and Lan systems. This board is not listed as Win 10 compatible on Ausus website but its still a great board with a big investment from me in the a i7 CPU and 16 Gig or RAM.