IOCrest 2 Port DB9 Serial PCI-e 1.0 x1 Controler Card, 1 unit - Kroger
PCI 2 Ports Serial RS232 Com Db9 Controller Card PCIE 1.0 x 1 WCH382 Chip with Low Profile Bracket - Walmart.com
The Primer: PCI Express 1.0 vs. 2.0 - 6Gbps SATA Performance: AMD 890GX vs. Intel X58/P55
2 Port Serial DB9 RS232 PCI-e 1.0 x1 with Low Bracket SI-PEX15055
HP AP769A PCI Express 1.0 x8, PCI Express 2.0 x4 Fibre Channel Single Port Host Bus Adapter - Newegg.com
Amazon.com: GODSHARK PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC (Will Also Work on PCI-E x4, x8, x16