ASUS Xonar DX PCI Express 2.0 Audio Card -- Dolby Home Theater Technologies & Richest Gaming Audio Effects for best PC audio upgrade. Powered by complete Dolby Home Theater technologies. Supports latest DS3D GX 2.0 for gaming on Vista & XP. VocalFX voice processing technologies to make gaming and online chat more lively and attractive. Delivers 35 times cleaner audio quality (116dB SNR) than most motherboard audio (85dB SNR).