I have a Pioneer 108 which is a 16x burner. I have updated firmware and antec cobra cables. I have tested this media with nero and burned a few just to see if the 4x was really 4x. My results = 4x it is! Good thing I only bought 5 pack. Just got me some Verbatim 8x dvd+r and they show up as 12x off the bat. Faster than the Ridata 16x media for sure!