normal Displayport supports direct Drive mode, they are electrically identical. the only difference is in the data packet information. whether the display has a scaler or not makes no difference if the display supports adaptive sync. im not saying there can't be limitations, since switching refresh in realtime constantly is alot different than clocking down the display temporarily,( which is probably why thehd 7000 series "freesync" only supported clocking down to 24hz to watch movies at native framerate.) but when the hardware clearly supports doing adaptive sync in this manner, it is not a satisfactory explanation.