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Chaosheng Electronic Server Graphics Card Electronic Gold Circuit Board Source FactoryPCB
high-speed signal cards such as graphics cards and memory modules are specially thickened and electroplated with hard gold technology. The coating is dense, uniform, and has higher hardness, which can meet the impedance consistency and signal integrity requirements of PCIe and DDR high-speed transmission protocols. It is the core process guarantee for the stable operation of the card.
2、 Core technology of PCB circuit board (board substrate)
1. Substrate structure technology
The graphics card and memory module dedicated PCB use high TG flaComputer board/graphics card/memory module PCB circuit board and gold finger thickened electroplating core technology
1、 Overview of Core Technologies
The core carrier of computer graphics cards, memory modules, and main control boards is PCB printed circuit boards, and their edge contact points (gold fingers) are key components for device signal transmission and power supply conduction. To solve problems such as computer lag, blue screen, and crashes caused by long-term plugging and unplugging wear, high temperature oxidation, signal attenuation, and poor contact, the industry mainstream adopts a nickel layer thickening+hard gold thickening electroplating process. Through a multi-layer composite coating structure, the conductivity stability, wear and corrosion resistance, and long-term reliability of the board are greatly improved, and it is suitable for high load operation scenarios of desktop computers, servers, and game consoles.
Different from ordinary immersion gold technology, high insertion andme-retardant FR-4 substrate, and some high-end server boards adopt multi-layer high-density interconnect structure, which has low dielectric constant, low water absorption, high temperature resistance, and deformation resistance characteristics. It can resist the interference of high temperature, vibration, and humid environment caused by long-term high load of equipment, and prevent card deformation and line breakage caused by stuttering faults. The inner layer adopts thickened copper foil lines (35-70 μ m) to ensure high current conduction and high-speed signal transmission, suitable for PCIe 4.0/5.0 graphics cards and DDR4/DDR5 memory high-speed transmission requirements.
2. Board process technology
Adopting precision etching, full coverage with solder mask ink, and edge grinding and chamfering process, the board edge is free of burrs, the circuit is free of short circuits and open circuits, and the impedance is uniform and consistent. Optimize the circuit layout for high-speed boards, reduce crosstalk and signal attenuation, and ensure efficient and stable graphics processing and memory data reading and writing at the substrate level, avoiding hardware level running lag, speed drop, and compatibility failures.
3、 Gold Finger Nickel Gold Thickening Electroplating Core Technology (Core Process)
The Golden Finger adopts a double-layer composite electroplating structure (bottom nickel layer+surface hard gold layer), with selective area electroplating throughout the entire process. It only thickens the coating for plug-in contacts, balancing performance and cost. It is the core technology of the board's durability, stability, and non jamming.
1. Bottom layer: Thickened nickel layer technology (nickel barrier layer)
The nickel layer serves as an intermediate transition barrier layer, using electroplating pure nickel technology, with a standard thickness of 120-200 μ "(3-5 μ m). The core function is to block the atomic diffusion between the PCB copper substrate and the gold layer, preventing the gold layer from becoming brittle and peeling off; The second is to improve the overall hardness and adhesion of the coating, and enhance the adhesion stability of the surface gold layer; The third is uniform conductivity, optimizing the consistency of contact impedance, and eliminating power supply instability, signal interruption, and computer lag caused by excessive contact resistance. The nickel layer is dense and pore free, which can effectively isolate water vapor and oxidizing media, and improve the corrosion resistance of the board.
2. Surface layer: Thickened hard gold electroplating technology
Different from ordinary soft gold and immersion gold processes, the gold fingers of graphics cards and memory modules are exclusively electroplated with hard gold (gold cobalt alloy) technology, with a gold layer thickness of up to 1-50 μ ". High end gaming graphics cards and server memory can be customized to be thickened to over 100 μ", with a hardness of HV130-200, far exceeding ordinary electroplating metal processes. The high-purity gold plating layer (purity ≥ 99.9%) has ultimate conductivity, oxidation resistance, and wear resistance, and can withstand more than 500 repeated insertions and removals. It does not oxidize, blacken, or corrode in long-term high temperature and high load environments, continuously ensuring high-speed signal transmission without damage, completely solving hardware contact problems, frame drops, memory errors, and machine lagging caused by metal finger oxidation and wear.
3. Complete electroplating process flow
Cleaning and degreasing of the board surface → acid pickling and micro corrosion roughening → pre immersion activation → selective masking → electroplating of thickened nickel layer → water washing purification → electroplating of thickened hard gold layer → multi-stage cleaning with pure water → drying and curing → edge chamfering detection → impedance and wear resistance testing, with precise control throughout the process to ensure uniform coating thickness, strong adhesion, no pinholes, and no delamination defects.
4、 Core technological advantages (solving the core pain points of computer lag)
High speed signal stability: The thickened nickel gold coating has extremely low impedance and high consistency, with no signal attenuation or crosstalk. It is compatible with DDR5 and PCIe 5.0 high-speed transmission, eliminating problems such as frame drop, memory read/write lag, and data loss in graphics cards.
Super wear-resistant and wear-resistant: The hard gold alloy coating has high hardness and can withstand frequent disassembly, chassis vibration, and long-term insertion and removal wear. The contacts are not easily deformed and worn, and the long-term use provides stable contact.
Ultimate oxidation and corrosion resistance: The dense nickel gold double-layer structure isolates air, water vapor, and dust, preventing the oxidation, blackening, and rusting of gold fingers, and avoiding blue screens, crashes, and overall machine lagging caused by poor contact.
High temperature resistance and aging resistance: adapt to the high load and high temperature working environment of the graphics card and memory, the coating will not soften, fall off, or age, and the long-term stable operation will extend the service life of the board.
Excellent conductivity performance: Strong high current conductivity, stable power supply, and elimination of hardware frequency reduction, lagging, and restart failures caused by power supply fluctuations.
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