AEHM.....Sry that i take a Hand on a ooollldd Fred.....BUT....don´t know where or what u
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"...look up different manufacturer's version of R9 280X...." but it can´t be a XFX r9 280x that u talk about
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..
Why?
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(Photo taken from my/a XFX R9 280X Box)
Sry for such a "Hard" answer....but...reading helps.....sometimes
btw: i guess why all manufacturer's say u need min.750 W... is an easy answer..not all PC Builder,using HQ PSU´s...so if it run with a 500W HQ PSU, it will run on a Cheap LQ 700 W PSU also
But this is only MY opinion !!!!!!!!!!!!!