According to tests performed at Ace's Hardware by editor Sander Sassen there are severe stuttering problems with the Audigy series when HyperThreading is enabled using Windows XP Pro SP1. I got the exact same specification of a system except that 3.06Ghz CPU so I cannot confirm the problems experienced. Rumour is that Creative is going to address this issue in a driver update. However it bothers me that they did not do this in the last update since Creative's driver politics is rather conservative (like 1 update a year if ever.)