most superior clocks in my experience run on DC, so you need a separate power and DC cable. Actually the quality of the DC cable matters as well, preferally lowest possible impedance. I cannot find any good reason to buy power and digital cables from the same manufacturer, though since there seems to be no overlap between the leading manufacturers of BNC (Habst, Shunyata, Sablon et al) and power chords (a long list including Nordost, Kubala Sosna, Acoustic Revive, Audioquest, Furutech et al)