LG-4165B write speed

I have a LG-4165B dvd-rw drive.
I know its supposed to write at x16, but nero writes with it (on x8 DVD-R discs) at x4 (13 mins per 4.5gb disc).

Why can’t I write at x8 or x16 ?
is there a program that shows dvd writing speeds ? (nero’s infotool shows only cd writing speeds).

Try other media. Go to LG forum since this is only for non-CD and non-DVD questions.