[Baum]

some time back i think it was done already....with nvidia, i think gigabyte where the first ones to take some mid end gpu and just leave of the power connector and give it a better/more efficient power section.

the result was funny: for me/us it meant that the powersection of most of the cards are not too optimized and those power-save-cards where absolute worse back then for overclocking.

please try to set the voltage on one of these cards and see if it works or the specs are tighter and it won't allow you.