I have an LG 23MP68VQ Monitor which has Freesync Support. I have just bought a Sapphire RX480 and for some reason it says that "AMD freesync is not supported". I have seen a few posts on this and it says that it only works with Display port. Well my monitor only has DVI, VGA and HDMI sockets and it states it supports freesync. can someone tell me what to do to get this working?