CMI 8768-8ch PCI Sound Card with SPDIF (including cable), WITH CMI8768 CHIPSET,HRTF - based CRL 3D extension positional audioAPI compatible with Microsoft, DirectSound 3D and Aureal A3D API3D Surround Sound Card supports rear side speakers, CX3D positional audio in 4 - ch speaker modeLegacy audio SB pro compatible24 - bit full duplex CODEC