Use the search-function and you will find something about the 1608.
It can be upgraded to 1616 and 4x DL
However, I´m not going to recommend it. The drive seems to be real slow for it´s speed : more than 10 minutes for 8x burn, almost 8 Mins for 16x burn, picky with media
Benq DW 1640, LG GH-20N, Pioneer BDR-208
Crucial M4, Sandisk SSD, Plextor M5S, Sandisk Ultra Plus, OCZ Petrol 256GB