What is the best 5.1 Sound Card for the Logitech Z-5500 Digital 5.1 Speaker System? I don't need a 7.1 sound card for a 5.1 speaker system, as I am trying not to pay extra for something that is not even used, like buying a 7.1 sound card, when I only need a 5.1 sound card, because the Logitech Z-5500 Digital 5.1 Speaker System is a 5.1 speaker system. Correct me if I am wrong, but does a 7.1 sound card make a 5.1 speaker system sound better or it doesn't matter, since it is only a 5.1 speaker system?