No, you most certainly CANNOT.
USB 3.0 accessories which plug into an external port are backwards compatible, but the H100i Link cable plugs into the USB 2.0 HEADER on the MOBO, not an external USB port. A USB 3.0 header has 20 pins while a USB 2.0 header has something like 4 or 5 pins. The headers on the mobo are totally and completely different and very much incompatible!
Okay, I thought it may have been possible but that it would just leave some of the 20 pins unused, but I guess not then, have to find another way to set up my Corsair Link then. Maybe an Internal USB Expansion Card.