I'm using a p4 1.6 with 1GB ram and a 60GB with 7200 rpm speed.It's working very well with Cakewalk Sonar.my sonar used to sometimes lock up or lose the tempo with my old Amd athlon 1.0ghZ.but now it doesn't with the P4.if you want to have a perfect noise free sound.you should use the Delta 66.it's just perfect for recoding waves.I use it with my sound blaster live 5.1.