Seal 4-Channel 32-Bit Sound Card (SSC4) CMI8738 4-Channel 32-Bit PCI Sound Card Compliant with PCI version 2.1 Bus Master & Advanced Power Management (PPMI) specification Supports Microsoft 3D and A3D interface Supports rear side speakers, C3DX positional audio in 4-channel speaker mode Supports full duplex operation for simultaneous and playback