It should'nt matter as far as the Corsair is concerned as I'm in the UK and I am using a CMPSU-620HX (US model) as opposed to the CMPSU-620HXUK (UK model) and it has not exploded yet (110v device on a 240v grid) so the auto sensor seems to do it's job, its just your plug into the wall socket you have to get right mate .