The main advantage seems to be the upgrade from DMI 2.0 to DMI 3.0. Which manifests itself as follows: Z97 motherboards have 8 PCIe gen 2.0 lanes to work with. Z170 motherboards have 20 PCIe gen 3.0 lanes to work with. (I think that is correct) Motherboards use it for Ethernet, USB, SATA etc... http://cdn4.wccftech.com/wp-content/uploads/2014/07/Intel-Sk... http://cdn2.wccftech.com/wp-content/uploads/2014/07/Intel-Sk...
No idea if that will be an advantage for the kind of workstation you need...
