It is measured that a silver cable has a more present 5khz-10khz area. So that is something that is there.
But honestly, I don't really think these is an audible difference in a 0.2 Ohm 10 dollar cable and a 0.2 Ohm 200 dollar cable.
But I haven't tried this yet! So it might not be true.
Most people muddle up the difference between measuring a cable with a dc voltage to determine its basic resistance and what happens when a cable has to pass an analogue signal which is far from flat dc, with amplitude peaks/troughs and variable frequency extremes. The Cable's capacitance and mutual inductance between cores then come in to play which gives each cable a different sound signature of its own ( as I said think of it as a passive equaliser) so there are many reasons why a 0.2 ohm cable at different prices can sound quite different.
Anyway perhaps we are getting away to far from the original thread's objective of publishing people listening experiences with the X1's and going down the Expensive Cable/Snake Oil debate.