What is the suggested speed 4X or 8X? TIA
Depends on the PC, burner, and media. I use 4X when I backup my DVDs.
Mine will go up to 8X, but I was told me burning DVD movies it is better to go 4X...
Mine goes to 16X, haven't found media that high yet...I have have no troubles with 8X with good (better quality) media.
With reliable media (for my burner it is RICOHJPN) I burn at 8x. Other media I burn at 6x, sometimes at 2x.