found it here Japanese manufacturer Plextor uses BenQ's design and hardware implementation for the Plextor PX-740A dual-layer DVD-burner. Priced at US$109 (MSRP), the internal PX-740A DVD±R/RW drive offers fast performance but lacks the advanced recording features found in Plextor's PX-716 Series DVD burners. The PX-740A delivers high recording speeds of 8X DVD+R Double-Layer (DL) and 4X DVD-R Dual Layer (DL) DVD (8.5 GB), as well as 16X DVD±R on single-layer DVD media. On the other hand, PlexTools Professional software is not bundled in the retail package. This means that features such as Q-Check for CD/DVD disc quality, or GigaRec will not be available with this drive.
Such features could not be implemented in the new Plextor drive, at least not for now, since the drive is based on BenQ's design, powered by the Philips Nexperia PNX7860E chipset and reference design.
OEM drives coming from Taiwan are currently sold US$40-45 to various manufacturers, forcing most Japanese second-tier makers out of the market. This time, Plextor decided to launch an OEM drive from BenQ, in order to deliver a more affordable recorder, as a Plextor spokeperson says.
Please, excuse my english. I am Italian