Best Deal" Thundersound 5.1 PCI Sound Card The ThunderSound PCI Sound Card is a full featured card supporting Surround Sound 5.1 specifications allowing for 6 channel audio output. The ThunderSound PCI Sound is also Microsoft WHQL certified and provides for real time DVD playback, and fully supports Dolby Digial AC-3 Sound. The ThunderSound� PCI Sound DVD features are Dolby Lab Certified and supports all DVD Navigation functions.