Originally Posted by chilled 
In case anyone is wondering, Corsair sources PSUs from Seasonic and CWT (Channel Well). They've split them across different wattages, but both make PSUs for Corsair's range.
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Organised by rated wattage:
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CX400w = Seasonic
VX450w = Seasonic
HX450w = Seasonic
HX520w = Seasonic
VX550w = CWT
HX620w = Seasonic
HX650w = Seasonic
TX650w = Seasonic
TX750w = CWT
HX750w = CWT
HX850w = CWT
TX850w = CWT
TX950w = CWT
HX1000w = CWT
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Organised by series:
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CX400 = Seasonic
VX450 = Seasonic
VX550 = CWT
TX650 = Seasonic
TX750 = CWT
TX850 = CWT
TX950 = CWT
HX450 = Seasonic
HX520 = Seasonic
HX620 = Seasonic
HX650 = Seasonic
HX750 = CWT
HX850 = CWT
HX1000 = CWT