I've only ever burned at 4x (slow drive/discs) but I hear 8x is fine. Make sure you use top quality media like Verbatim or Maxell. You'll have problems with other media, and if you're using an LG drive, you need to change the bit type or sommat to DVD ROM from whatever it is to start with. edit: I somehow thought you meant burning, my bad. For reading, any speed is fine.