Fully tested on Windows XP and compatible up to Windows 7. Drivers can still be downloaded from StarTech.
Specifications:


7.1 surround sound audio output


Supports 48/44.1 kHz sampling rates for both playback and recording


Compatible with Dolby® Digital EX and DTS ES 7.1-channel DVD soundtrack playback


Supports Plug and Play installation with Windows WDM drivers


Two internal auxiliary inputs


Full-duplex operation: 8 output streams and 2 simultaneous input streams


DirectSound™ 3 hardware acceleration


Supports PCI Version 2.2 with ACPI and PMI support