Brainboxes PCI 2 port OPTO RS422/485. Host interface: PCI. Data transfer rate: 921600 Mbit/s. Width: 93 mm, Depth: 122 mm, Weight: 97 g. Compatible operating systems: Windows 98/ NT4/ 2000/ XP/ Server 2003 Windows XP x64 bit Edition / Windows Server 2003 x64 bit