I know the speed differences, but how are the speeds different? Like are there any physical changes because they both look identical so where did the extra 9gbps capacity come from?
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The long story short is that faster cables preserve signal integrity better, and that’s generally the result of either technology/design upgrades (shielding, different twist, etc), or tighter manufacturing tolerances.
High speed signals are more of a fuss as the speed goes up, and at some point things break when everything isn’t just right. The endpoint simply cannot distinguish between 0 and 1 enough anymore.