ASUS Xonar Essence STX. Audio quality: 24 bit, Audio output channels: 5.1, Line-out Signal-to-Noise Ratio (SNR): 124 dB. Host interface: PCI-E. Width: 111.15 mm, Height: 168.26 mm. Minimum RAM: 256 MB, Minimum processor: Intel Pentium4 1.4GHz / AMD Athlon 1400, Minimum hard disk space: 60 MB