There is one area where silver definitely makes a positive impact and that is with digital cables (including COAX and HDMI). Silver is a much better conductor than copper and will charge/discharge much faster. This is critical when dealing with digital square waveform signals that are extremely high frequency (like megahertz). For normal audio waveforms, I prefer pure copper.
The other aspect of digital cables is length. It is said that you should really use 1.5 meter or 4.5 feet as minimum length to reduce the amount of signal reflection back to the originating transceiver. Signal reflections can cause distortions in the waveform and cause inaccuracies. I have used short cables and this can be heard as a slight smearing of the audio. I always use 2 meter / 6 foot digital cables just to be sure (toslink doesn’t count here because it’s light).
This is the cable I use:
http://audiosensibility.com/blog/products-2/digital-cables-occ-copper-and-occ-silver/#!/Neotech-NEHH-4200-HDMI-1-4-Cable/p/17895256/category=4059160
I like it because it’s not extremely expensive and he cryogenically treats the cable (which solidifies the conductors just a little bit more and enables more high frequency transmission). The Audioquest Chocolate is also a good choice as it uses silver-plated conductors as well. I might think the Neotech has a slight advantage because Audio Sensibility does the cryo treatment.
I have wondered about upgrading to something better like Wire World Starlight 7 or Silver Starlight 7, but other things have higher priority on my list and I don’t feel that my Neotech HDMI cable is a weak link yet.
You may or may not notice any difference in your system with upgraded HDMI cable. However, you might notice a slight improvement in video clarity.