Every switching power supply I have seen can do 220-240 (setting the voltage selector) or 100-240 (autoranging). I can believe the desire for less noise in L-L connections, although I have never encountered it with computer equipment. I have encountered it when I worked in TV. So when commodity PCs came around, why the shift from 240 L-L to 120 L-N? Maybe because it was the only L-N choice below 277 and they wanted to do L-N instead of L-L?
240 L-L is what I'm planning to do at home once I find the right surge protection and UPS equipment that is compatible. But for 240 L-N all the European stuff becomes usable.
