I have a xonar hdav1 3 deluxe soundcard on my Rampage V Extreme motherboard. When I go to the controlpanel and switch to the 5.1 mode, the soundcard mixes up de soundchannels. What should be in front comes from the rear and sometimes the sub can be heard out of one of the speakers. When I raise the samplerate above 48 kHz the sound becomes very odd. Before this one I had a Rampage IV Extreme motherboard. Everything worked fine without any problem. Also on my brothers Z87-Expert the xonar works allright. With the Rampage V it doesn’t matter wether I use Windows 10, 8.1 or 7. After BIOS 0706 en higher the xonar is actually working. With the older Biosversions there was no sound at all. Does anyone know what I should do to use my xonar soudcard properly? I now use bios 1103 en Windows 8.1 with the Windows 8 driver from the Asussite.