PCIe 1x DB9 Port Serial Card, Moschip 9901 Chipset, with Low Profile Bracket. This card provides an easy way to have a serial port in your PCI-Express enabled computer. This low-profile PCI-e 1x card has the Moschip MSC9901 chipset making it fully compliant with the PCI-Express Base Specification 1.0a. This card can achieve 2.5Gbps throughput and sports an industrial standard 16C550 UART. If all you need is a simple solution for a serial port, this is an affordable one. Best Connectivity SD-PEX15021 PCI-Express RS232 1x Serial Port. SYBA PCI-Express 1-Port DB9 RS232 Serial Card with Low Profile Bracket - RoHS Model SD-PEX15021.