The nono hdmi cables are all optical. Due to the bigger formats, copper cable hcan only be used in limited lenghts. The 8k cable has olso the lastest hdmi 2.1 version. Alle optical hdmi cables are unidirectional, there is a pc side and a displayside.

An optical HDMI cable is a type of HDMI cable that uses optical fibers to transmit digital video and audio signals. Unlike traditional copper HDMI cables, which use electrical signals, the optical HDMI cable uses light to send data. This results in higher signal quality and longer distances without signal degradation.

Optical HDMI cables are ideal for situations where long distances need to be covered, such as between devices located far apart, like a TV and a receiver. They are also immune to electromagnetic interference, ensuring a cleaner signal.

The difference between a 4K optical HDMI cable and an 8K optical HDMI cable lies primarily in the amount of data they can transmit. A 4K HDMI cable is designed to support 4K video resolutions (3840 x 2160 pixels), while an 8K HDMI cable is intended for higher 8K resolutions (7680 x 4320 pixels).

The 8K HDMI cable is capable of processing much more data per second, which is necessary for the higher resolutions and frame rates that 8K video requires. This means that the cables need more bandwidth, more advanced technologies, and higher data speeds to transfer 8K signals without loss of quality. The 4K HDMI cable is generally sufficient for 4K images and 60Hz frame rates, while the 8K cable is optimized for 120Hz and higher frame rates.