The issue i'm facing right now is that after installing my mobo, i can't seem to get my Left Rear (LR) and Right Rear (RR) speakers to work properly when i set my setup as 5.1 from Windows audio configuration. But when i set it to 7.1 both the LR and RR worked as side speakers instead, which is not what i really want. I can't seem to get it work in 5.1 mode.
You can flip the Side/Rear speakers is you set the output to 7.1.
I also assume you are using an analog connection, and not optical?