Having just looked on amazon, seems a Cable isn’t simply a cable. I had heard of cat 5,but seems there is a cat 8…
After a 3m cable for pc to router. Pleaseto explain how I can get it wrong and what I should be buying.
Manies thankings 
Simply the higher the CAT the higher the speeds you can get through them mate. In your house you’ll be fine with CAT 5, unless your in a data centre at yours you’ll not need CAT 7 or 8.
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That said if you can fine a one the length you need that is a higher CAT then get it, as it’ll let you have faster speeds.
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Cat5e pantehs. Or Cat6 would be what your looking. 5e supports 1000Mbps Cat5 really 100Mbps.
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Thank you peoples! 