Re: 7.1 Surround Sound
A 7.1 virtual surround sound works with stereo configuration and games don't have any specific 7.1 VIRTUAL surround sound configuration.
There are some REAL 5.1 surround sound headsets and many games supports that sound configuration. Normaly, these headsets are more expensive but offers a good perception on FPS games (if well implemented in game, ofc). Many don't come with sound card, so you may need one with real 5.1, if your motherboard don't have it.
If you play lots of FPS games, I would recomend a good REAL 5.1 surround sound headset because it gives you a more accurate perception where sound comes, helping to identify incoming threats.