I have an Intel BX440 board, an old Asus CUBX. I started with a new system drive and clean WinXP install before I started with my new ND-2500A. I only use Sonic Recordnow DX and only burn -R.
I have inconsistent Nero CD-speed scans on the G04s, which I posted in the big thread. A few are ok, most are not great and some are really bad. Note, that all the discs verify, DVDInfoPro says they're error free and they are readable. Most are data discs, but one was a movie and it played fine in my player.
I have at least 40 blanks left, but I've decided to stop using them in favor of my Taiyo Yuden's, until a firmware or some other solution has been found to improve the situation. The Taiyo Yuden's give much cleaner Transfer Rate curves, consistently every time.
I do all my DVDInfoPro and CD-Speed tests in my Lite-On LTD163 DVD-Rom, as opposed to the NEC.