Sorry you are wrong, copper will tarnish, gold never will in that lies the difference. Gold is the only metal that will not tarnish and because of that one fact it make a better connection with electronic gear then copper or any other kind of metal.
So its not a gimmick, it is used widely in the making of mother boards and other pieces of computer gear today and has been used for that going all the way back to the days of wired computers before the Integrated Circuit Boards. Copper tarnishes, gold does not, not a gimmick but the smart way of doing things, in some cases the only way.
Look it up, 2ed age computers and how they were made. We are in the 3rd age. Look up how one bite was made with wire and what they used for that wire. That's right, GOLD.
The following was taken from a discription of the IBM 1401 (1959 through 1971)
These circuits were constructed of discrete components (resistors, capacitors, transistors) mounted on single sided paper-epoxy printed circuit boards either 2.5 by 4.5 inches (63 by 110 mm) with a 16-pin gold plated edge connector (single wide) or 5.375 by 4.5 inches (136.5 by 110 mm) with two 16-pin gold plated edge connectors (double wide), that IBM referred to as SMS cards (Standard Modular System). The amount of logic on one card was similar to that in one 7400 series SSI or simpler MSI package (e.g., 3 to 5 logic gates or a couple of flip-flops on a single wide card up to about 20 logic gates or 4 flip-flops on a double wide card).
River


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