The DVD Burner Optiarc AD-5670S is a slot-in drive. The Optiarc AD7670 burner adds support for DVD-RAM but both drives share the same hardware and only differ in firmware. However you should not try to simply flash an Optiarc 7670S firmware on an Optiarc 5670S drive or vice versa. This will NOT work.
The following firmwares are available for download here:
Overview on the used writing strategies