I was looking at my 255EXT and 250EX and it has big difference in power consumption and even over my MTS250S dose the PFC make that much of a difference?

MTS250S @ 240V Maximum Inrush Amps (I1MAX) = 36.0A Maximum Operating Amps (I1EFF) = 30.0A WO/PFC

PT250EX @ 240V Maximum Inrush Amps (I1MAX) = 45.0A Maximum Operating Amps (I1EFF) = 36.0A WO/PFC

PT255EXT @ 240V Maximum Inrush Amps (I1MAX) = 33.6A Maximum Operating Amps (I1EFF) = 20.0A W/ PFC