Well I just learned my Creative X-Fi Titanium can only output 2 channels with optical. A major kick in the balls by creative, GG not documenting anything. I would stear clear of Creative X-fi cards for different reasons too, mainly crappy drivers and limited audio quality. Now before I buy another sound card I want to make sure it can do full 5.1 over optical. After looking at many many sound cards, I find it interesting that none of them specify on how many channels are supported through optical. I would assume 5.1 is the standard but not after my shitty Creative X-Fi card. I have been looking at a few Xonar Essence STX (I don't need the headphone amp though) HT | OMEGA CLARO Plus+ Theres also the auzentech cards which im highly unsure of, should probably avoid. They come with 3.5mm to optical adapters? How can you get 5.1 out of a single 3.5mm jack? If you are wondering. I need to plug my computer into an audio receiver, I can't use 3.5mm jacks. It would have to be optical or coaxial. I can get the Asus at a local store which is a huge plus since I can return it if it doesn't work. At the same time it is more expensive and I don't really need the headphone amp.