SIIG IC-510012-S2 5.1 Channels 16-bit PCI Interface SoundWave Digital Audio: 16-bit SNR: 68.5dB Operating Systems Supported: Windows 7 (32-/64-bit) / Vista (32-/64-bit) / XP (32-bit) / Server 2003 & 2008 (32-/64-bit) / 2000 System Requirements: DirectX 8.1 or above is required Multi-channel 2/4/6 speaker system Weight: 0.45