StarTech.com 8 Port PCI RS232 Serial Adapter Card High Speed 16950 - Cable Included (PCI8S9503V) Adds eight high speed RS-232 serial ports to your computer Designed for critical applications using embedded systems and computer based machinery Compatible with both 3.3 volt and 5 volt server slots Compatible with most major OS platforms, including Windows, Linux and Unix Offers eight high speed RS-232 serial ports to your computer PCI Bus Version 2.2 compliant Works with both 3.3 volt and 5 volt server slots Universal 32 bit PCI bus