The point is, I can't use x1_2 slot because it's blocked by main GPU. PCIEX16_3 slot shares bandwidth with PCI-E 1x slots and ASMedia SATA controller (which I use at the moment). PCIEX16_3 slot is blocked pretty badly by cables and other crap so I can't really fit anything there. I also have esata & usb panel there (the slot is not in use).
I too have the issue that windows reverts to 5.1 when using headphone port. I don't think that it will do hurt anything if you do not use the SBX stuff though. In stereo mode it doesn't revert to 5.1. By the way, for headphone mode this might be working workaround:
and then select full range speakers form the next page. I haven't tested but I think those settings won't revert.
I too have the issue that windows reverts to 5.1 when using headphone port. I don't think that it will do hurt anything if you do not use the SBX stuff though. In stereo mode it doesn't revert to 5.1. By the way, for headphone mode this might be working workaround:
and then select full range speakers form the next page. I haven't tested but I think those settings won't revert.