Chipset: C-Media 8768. PCI Rev.2.2 compliant with bus mastering modes. Plug and Play. HRTF-Base 3D Positional Audio. Support both DirectSound TM3D and A3D Interface CMI8768 - 8CH 8 - channel PCI Audio Sound Card HRTF - based CRL 3D extension positional audio API compatible with Microsoft, DirectSound 3D and Aureal A3D API 3D Surround Sound Card supports rear side speakers, CX3D positional audio in 4 - ch speaker mode Legacy audio SB pro compatible PCI Sound Card support: environment audio extension, echo, karaoke key, surround, Win95, Win31, Win98, NT4.0, Win2000, and Linux MPU - 401 port, Dual game ports 24 - bit full duplex CODEC 8 Channel Sound Card with ports: 1x Line-IN; 1x MIC-IN; 1x Front-Out; 1x Rear; 1x Bass; 1 x Surround Single chip design