I'm looking for a device to add 5.1 surround to my PC. The AMD APU doesn't support 5.1 over HDMI for whatever reason, only stereo, or I'd use my normal HDMI optical audio extractor as usual. I have a ...

If you just want the basic "I can hear sounds coming from all around me" then pretty much any 3D game supports it. Even something as old as Half-Life has perfect surround sound on my Audigy 1 + 5.1 ...