Your cable is probably a high bandwidth HDMI 1.4 cable. There is now a new HDMI 2.0 standard which allows you to pass a 4k 60/50hz signal where the previous standard was only at 24/25/30 hz at 4k. But there is no real source content at 4k 60hz yet and only really useful for computer gaming type applications and not many computer GPU's output this yet anyway. But they didn't change the cable spec for HDMI 2.0 so good quality HDMI 1.4 cables will hopefully pass this 60hz 4k signal just fine later on once there is a reason to use it. as mentioned above most sources are only 24-30 Hz but your tv up samples the frame rate before displaying it to try and create the effect of smother motion which can be especially important for sports but may help in some high paced movies as well.
