StarTech.com 2 Port PCI RS232 Serial Adapter Card with 16950 UART - Dual Voltage (PCI2S950DV) Dual Voltage ensures compatibility with both 3.3 and 5.0 volt PCI slots Standard and low profile bracket included allowing installation into almost any system Two high performance 16C950 UART channels Maximum data transfer rate of 460 Kbps 128-byte deep FIFO per transmitter and receiver PCI 3.0 and Power Management 1.1 compliant Automated in-band software flow control using programmable X on/Xoff in both directions Automated out-of-band hardware flow control using RTS / CTS and/or DSR / DTR