obviously they are saving parts, i got only 4 voltage regulators instead of 8 per board
this causes high temperatures and high power consumption...(and lower Hashrate)
That's interesting. Only 4 of the 8 are actually working anyway (as seen with bertmod). They probably realised this and decided not to pointlessly install 8. As such, it shouldn't make any difference.
Margins. Turns out they weren't necessary. Hence the welcome drop in wattage at the wall.