The HP LaserJet P4515x can handle almost everything you throw at it, from any professional environment. It�?s a little bulky but nonetheless considerable for what it can certainly provide. If the LaserJet P4015tn can print at a speed of 52 ppm, well then be more surprised with this unit�?s rated printing speed of up to 62 pages per minute. It comes standard with a built-in status LCD and USB Hub. The X next to its model indicates extra paper tray capacity, and has nothing to do with its consumable particularly the HP CC364A toner cartridges which you can choose from a standard-yield or the high-yield replacement.