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Add 2 RS-232 serial ports to your full height or low profile computer through a PCI Express slot Data transfer rates of up to 460 Kbps for peak serial device performance Native single-chip, single lane PCI Express offers increased speed and reduced CPU load by up to 48% Standard and low profile bracket included ensuring easy installation into almost any system The PEX2S952 PCI Express based serial card turns a PCI Express slot into 2 RS-232 (DB9) serial connections. The adapter card is based on a native single chip design, that allows you to harness the full capability of PCI Express (PCIe) - providing optimum reliability and speed while reducing the load applied to the CPU by as much as 48% over conventional (bridge chip) serial cards. The RS232 Serial Adapter Card is compatible with a broad range of operating systems, including Windows® and Linux (Kernel 2.6.11 and up). Plus, the adapter card includes an optional half-height/low profile bracket that allows the card to be installed in virtually any computer case – making it that much easier to add serial ports to a PCI Express enabled computer, regardless of the size of the computer case. Backed by a StarTech.com Lifetime warranty and free lifetime technical support. What’s in the box 2 Port Serial Card Low Profile Bracket Driver CD Instruction Manual