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This PCI-E 1 to 4 port multiplier riser card is specially designed for mining rig expansion. It can expand a single PCI-E interface into four channels to connect multiple graphics cards, solving the problem of insufficient motherboard slots. Adopting USB 3.0 high-speed transmission scheme, the signal is stable and reliable without loss. With excellent heat dissipation and circuit protection design, it supports long-term uninterrupted work. Simple installation and strong compatibility, ideal choice for building and upgrading BTC mining machines and multi-GPU working devices.