ASUS PCI-Express x1 Sound Card XONAR ESSENCE STX/90-YAA0C0-0UAN00Z Hi-FI headphone amplifier Main stereo RCA out, headphone out, SPDIF out, line in (Mic in) Other frount audio header, Aux in, S/PDIF header Sound noise ratio (SNR) 124 Gx 2.5 (EAX 5.0)