I had the same problem. I bought a few cheapo cables from the bay and none of them would work at 120hz. So I bought the 3m version of this cable: http://www.overclockers.co.uk/showproduct.php?prodid=CB-003-SR Everything works fine now and I have also been told the OcUK Value cable work fine also but I haven't tested those myself. What I would really love to know is if anyone has bought any extra glasses 3D yet? I would love to buy an extra pair but Samsung are being extremely unhelpful sourcing a model number that definitely works with this monitor.