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The SI-PEX40058 HyperDuo controller card comes with 2 internal SATA III and 2 external eSATA III ports, each supporting 6Gbps high-speed data transfer and backward compatible with SATA II and SATA I devices. Designed with PCIe 2.0 x2 interface, it fits all common PCIe slots for easy system expansion. Featured HyperDuo smart tiering technology automatically optimizes storage performance by mixing SSD and HDD. It supports hot-plug for convenient drive replacement, delivers stable and reliable performance for daily office, file storage and small server use. Compact green circuit board design fits standard chassis perfectly, a cost-effective choice for upgrading storage connectivity.