I am getting continuous intrusive hissing/buzzing from both the Speaker Out and Line Out connectors; regular audio seems to be outputting OK, but this hiss is always in the background. At first, I suspected interference from a case fan cable, so I re-routed it away from the soundcard, but there was minimal change in the hiss. Is there any way to get rid of this hiss? Motherboard is a QDI Advance 10T-A, fwiw.

[EDIT] Well, that was convenient...

I swapped in some quieter-running fans to replace the POS default ones and added a set of desktop speakers, both of which I was going to do anyway, and the hissing is basically gone.