This horse might be dead, but according to the specifications on Newegg, only one of the two x16 slots is 3.0 and for x16. The other one is wired 2.0. Now in order to get the 3.0 you have to have a later processor. See below: https://www.newegg.com/asus-rog-strix-b350-f-gaming/p/N82E16813132988...