Weyoun: On my p200 mmx (computer before current athlon 650), I never had a problem burning at 4x as long as I didnt try to do much (if anything) while burning. If I was getting that many bad CDs I would have dropped the burn speed. But isn't burnproof great? I just got the TDK drive (exchanged da Yamaha, now I need to swindle my uncle outta the reciept for the drive so I can get the $50 MIR ;-)) and its been great so far.