The ASUS ThunderBolt is a PCI-Express addon card, integrating a Killer 2100 controller with its own dedicated memory; and in probability, an ASUS AV100 audio chipset found on low-profile ASUS Xonar sound cards such as Xonar DS. It provides 7.1 channel audio out with over 100 dBA SNR, and packs software that emulates popular positional-audio technologies such as EAX, and various Dolby/DTS mojo. The card draws power from a 4-pin Molex connector. The entire card is covered by an EMI shield, which also gives it a nice "product" feel.
Source: TPU