I wouldn't bet even a cheap motherboard on this. You are referring to a post from someone extrapolating his experience with 7970s (and who didn't specify the tested models) to all 7xxx cards.

If fools base their setup on such limited information and burn all their systems at once they will have only themselves to blame.

If you don't have equipment to check for sources of problems (clamp meters and/or infrared imaging) or references of the very same setup already working for someone else, always validate a new setup on a single system before risking your whole mining operation : 48h of downtime for a rig and a single motherboard to replace may be manageable out of 10 rigs, all failing at once is a week-end lost replacing everything and probably a good part of a month worth of income lost...