Couldn't the same be said about moving from the massive ISA connector contacts to PCI? or to the even smaller PCIe? Or perhaps maybe just like back then, electronic engineers put in some work to ensure there was plenty of contact area for the current required? The latter is a heck of a lot more likely than your obvious fanboy assumption which has absolutely no evidence to back it up. Those new connectors appear to be Molex Micro-Fit 3.0 which can handle 8.5a per conductor. 6 conductors (the other 6 are grounds) would then give a max current rating of 51a @ 12v, which is 612 watts. Seems to me that if that is indeed a micro-fit 3.0, then it definitely is safe for 400w.