Here is the blah about the Nordost Valhalla power cable at about $2500 for a 2 meter length , pretty mind boggling
The cable consists of 7 solid extruded silver 16 AWG OFC conductors suspended in a Dual Micro Mono-Filament design. By using solid core extruded silver over OFC conductors, strand interaction, hot spots and carbonization, which can occur in stranded cables, are eliminated ensuring optimum performance. The VAHALLA power cable has a very high propagation speed. Unlike conventional power cables which have propagation speeds of less than 50% the speed of light, VALHALLA Reference power cord has a speed of 90 % the speed of light. This offers vast improvements in all facets of musical and visual performance. VALHALLA power cable also uses Nordost's proprietary 'Dual Micro Mono-Filament' technology which greatly enhances audio and video performance. This technology uses two FEP Mono-Filament threads which are wound around one another. These dual Mono-Filaments are then drawn around the conductor in a very precise helix pattern, this construction introduces more air space around the conductors and insulation contact with the conductors is reduced by more than 85%. Extruded FEP insulation is superior to all other materials in that it has very low signal loss and a high thermal efficiency meaning that it dissipates heat very quickly. This allows greater power to be transferred more efficiently. The use of FEP Micro Mono-Filament construction which has a very low dielectric constant and minimal insulation contact with the conductor means power is transferred extremely efficiently. Dual Micro Mono-Filament technology increases current flow, improves the transmission speed to over 90% the speed of light and dissipates heat. This design lowers the resistance of the cable keeping power loss extremely low.
By using very precise manufacturing techniques, whereby the seven mono-filament silver plated power conductors are wound in a special configuration, the impedance, capacitance, and other electrical specifications are maintained to very tight tolerances. Another benefit of this design is to eliminate external EMI/RF interference. The result is truly superb sound quality and stunning visuals.
This is cutting edge technology I bet the cost of development and research for this cable did not come cheap, then as said earlier theirs the marketing. Still a high price though.