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This PCIe 1X to 4×16X enhanced expansion riser card is professionally designed for mining rig upgrades and expansion. It fully expands the limited motherboard PCIe slots to connect multiple GPUs at the same time. Adopting reinforced PCB and stable circuit design, it effectively reduces signal attenuation and current interference. Support 24-hour continuous operation, simple installation and wide device compatibility. It is a high cost-effective accessory for building and expanding multi-graphics card mining systems.