Powerful quad core cpu with the industrys first quad core 1 5 ghz cpu with system on chip technology delivering high performance interpreting and rendering emulation these powerful printers are twice as fast as conventional dual core based mfps two times faster dual scanning the dual scan document feeder scans both sides of a document simultaneously capable of scanning up to 240 ipm which is twice the scanning speed of the x4300 series and six times that of other printers work smart just