What are the requirements to use Project FreeSync?
"To take advantage of the benefits of Project FreeSync, users will require: a monitor compatible with DisplayPort Adaptive-Sync, a compatible AMD Radeon™ GPU with a DisplayPort connection, and a compatible AMD Catalyst™ graphics driver. AMD plans to release a compatible graphics driver to coincide with the introduction of the first DisplayPort Adaptive-Sync monitors."
Seriously, Freesync does not exist yet. There is no cable you can buy that will allow you to use Freesync. But when it does, the above USFRet quoted is likely what will be needed, but until it is released, things can change (though unlikely).