sb live 5.1 wont work with 4gb ram? damn, that ruins my plan of using one in my 4gb system ffs lol.
On the dolby surround over stereo compared to 5.1 headphones: Its more accurate, and the sound quality is far higher, since the the money has gone into two decent drivers instead of lots of smaller ones etc. Some of it is going to be purely that it was an upgrade for me, from an audigy 2 with medusa 5.1's to a xonar d2 with the medusa's then getting the pc350's.
Back when 5.1 headsets first came out, they were better than the emulated version, but then the emulated software versions got a damn site better