Bandwidth for cables refers to the range of frequencies used for the transfer of information through data cables. The broader the bandwidth the more data that can be carried. According to different band width, HDMI cable can be divided into: Standard, High Speed,Premium, Ultra-High Speed.
Standard means around 4.9 Gps, enough to handle 1080P signal.High-speed cables can support double the bandwidth at 10.9 Gbps. The premium offers high transfer speed of 18 Gbps, and the ultra-high-speed offers higher transfer speed that is up to 48 Gbps.
If you are looking to buy a HDMI cable that can transfer 4K videos, you need to avoid cables with standard transferring speed.
But don’t worry, as the technology develops, 4K videos are well accepted among consumers. Most of the HDMI cables that are market available support 4K signal transferring. It could be kind of hard for you to get an antique HDMI cable.