I use silver mains cables and work fine with my system They have a huge effect on my balanced mains and power amp and quite a big effect on my copper DAC/PRE
I think like everything else with cables the quality of the materials and how well its constructed makes a huge difference. These cables replaced thoses huge cables PS Audio used to make. I had quite a few other cables through my time, the best thing I can say is that I no longer play around with cables I just do not feel the need for that