There is no such thing as a CD being a "certain speed," when you burn a CD at 1X, 2X, 4X, 8X, etc. etc. you are just literally burning the same bits at that speed multiple, but the actual bits burned are identically spaced, etc. The only reason people recommend burning at low speeds is because of the concept (sometimes false) that the bits will be burned better if they are burned at a lower speed because the laser will spend more time burning each bit. A CD burned at 1X and 8X will be exactly the same, except (ideally) the 8X bits will be slightly lighter and may have problems with a relatively weak CD player.