Product Introduction: Cmi8738.Multi-Channel Sound Effect Chip PCI-e Sound Card Adopts PCI-Express Bus Slot, Supports-Channel Surround Sound Output, Supports DLS Sound Library Technology, Supports A3D.0 and Ds3d, compatible with DirectSound 3D and EAX Sound Effects. It Supports 24-Bit SPDIF out and SPDIF in (Optional), Provides Surround Sound Field and Clear Sound Quality, and Is Suitable for Home Cinema, Large 3D Games, Music Appreciation, Karaoke and Other Entertainment. Product Parameters:, Full Duplex.Channel PCI-Express Sound Card, Using Via Bt1723 Envy24d Multi-Channel Sound Effect Chip, in Line with PCI-Express X1 Specification Revision.14, in Line with AC'97 Specification Revision.35, sound Sampling Rate 24-Bit, 48 KHz Support Playback and Recording, Support Front LR, Surround LR, CentreSubwoofer, SPDIF-Out7, optional Sub-Card Supports Rear Surround LR, Linear Input LR, Mono Mic-In, SPDIF-In8, Noise Balance Cancellation When PC Power Is off Or on