Brand new and high quality full-duplex sound card and PCI-Express 5.1. Using CMI8738 5.1 multi-channel sound chip. In line with PCI-Express x 1 specification revision 1.1. In line 66 channel AC”97 specification revision 2.3. Audio sampling rate 24-bit, 48 KHz playback and recording support. Support for front L/R, Centre/ Subwoofer, S/ PDIF-Out. Surround optional daughter card supports the L/ R, Mono Mic-In, S/PDIF-In. When the PC is turned off or the power supply noise cancellation balance. 5-channel surround sound output, support for DLS sound library technology support A3D 1.0 and DS3D, compatible with DirectSound 3D and EAX sound effects. Support Windows 9x/2000/xp and Windows NT/ Windows 7 system.