Okay so, pretty much anything is capable of simulating 7.1 surround sound.
It depends on what you're using it on.
For gaming, you can either toggle in-game audio settings for a surround sound, or you can download equalizing software.
For music, you can't force an audio file to be surround sound. It depends on how the file was recorded.
HD600's are a pretty good set of cans. Consider getting a DAC and an AMP for the best audio experience. Never buy a sound card.
Good luck!