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Category 8 (Cat-8) ethernet cables have a huge difference from the previous versions because it can support a frequency of 2 GHz. It is limited to a 30-meter 2-connector channel. Category 8 cables also require shielding wire structure. This cable can support a speed of 25 Gbps or in some cases 40 Gbps. The looks and physical appearance of cat8 are similar to the previous cables. It can be terminated with RJ-45 or non-RJ-45 connections. This cable also comes with backward compatibility. You can also use it with a standard Cat7 connector.
Source: Category 8 (Cat-8)