Golden Finger PCB
Gold finger is a brass contact, can also be said to be a conductor, gold finger by the many gold-colored conductive contacts, because of its gold-plated surface and conductive contacts arranged as a finger-like, so called "gold finger", gold finger boards need to be gold-plated or immersion gold. Because of the strong oxidation resistance of gold, and conductivity is also very strong, so in the memory stick and memory slots connected to the parts plated with gold, then all the signals are transmitted through the gold finger. Gold fingers are actually copper-clad boards that are then coated with a layer of gold through a special manufacture.
So, the simple distinction is that immersion gold is a surface treatment manufacture of the circuit board, while the gold finger is the circuit board has a signal connection and conduction parts. In the market practice, the gold finger may be not really made by gold. Because of the expensive price of gold, more memory are currently using tin-plated instead of tin material from the 1990s began to popularize the current motherboards, memory and graphics cards and other equipment, "gold finger" is almost always used by the tin material, only some of the high-performance servers or workstations will continue to use gold-plated parts of the contact point of the practice.
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