Justin from HardwareZone reviewed the BenQ DW1640 DVD writer. Here's a short snip from his review:

New write speeds brought about by this model include 8x for DVD+RW, 8x for DVD+R DL, 6x for DVD-RW, 4x for DVD-R DL, 48x for CD-R and 32x for CD-RW media. This combination of write specifications is currently the fastest available for internal DVD writers and by technical specification comparison alone, the DW1640 is undeniably an appealing proposition.



Link: HardwareZone