I think to buy a BenQ and I buy the father of a Plextor
Plextor 740 is from the BenQ family :
It clearly looks like my 1620 OEM :
Here is the faceplate of my BenQ 1620 OEM : I’m Thour Father !
Specifications are identical to 1640… DVD-R DL 8X was a typo or a far/near speculation
Plextor 740 = BenQ 1640