SIIG CyberSerial Dual PCIe 2 9-pin Serial Ports (16950 UART) to PCI Express System Model JJ-E10D11-S3 Type: PCI Express to Serial Port Card External Ports: Two 9-pin Serial Ports Operating Systems Supported: Windows 7 (32-/64-bit) / Vista (32-/64-bit) / XP (32-/64-bit) / Server 2003 & 2008 (32-/64-bit) / 2000 Specifications: Regulatory approval(s): FCC Class B (DoC) & CE RoHS-compliant Chipset: Oxford OxPCIe952 Compliant with PCI Express Base Specification Revision 1.0a Built-in 128-byte FIFO buffers dramatically increase data transmit/receive speed, especially under Windows multitasking environment 4-layer PCB board: separate layers for data & grounding. Greatly reduces signal noise & loss. Delivers more reliable high-speed data transfers Enhanced bracket design to prevent bending. Connected to PCB with washered screws for a more secure connection