My Home rig (see sig below) was dual booting Vista Ultimate and XP Pro, both 32-bit. The two hard drives and the Samsung burner are SATA devices, and the Benq is IDE.
Strange thing is, the Benq rips just as well under Vista as XP, but I can only get it to burn at 2.4x under Vista, no matter what media use, or which burning app I use (Nero, IMGBurn, DVD Decrypter). DMA is active (Mode-2). The Samsung burns at its rated max (media willing, of course).
I recently wiped the XP Installation and installed Vista Business 64-bit just to experiment with a 64-bit OS (and take advantage of the full 4GB of RAM ). Same thing here with a 2.4x max burn speed for the Benq. Windows sees the drive as capable of burning at higher speeds (according to Everest), so it must be some hardware related issue with Vista (both 32 and 64 bit).
Anyone else using a 1650 under Vista and either having or NOT having this issue?