Ok thanks.
I read as well that sometimes even when undervolting there are cases when the settings will go back to default. At max wattage is the 1600w psu still ok? I just don't want to end up with fried GPU's!
Totally safe, without any issue
Yes, it's true, sometimes, once a month or twice, my system crashs and overclock settings go to default mode, and consumes more power, but the TDP of 3070 is 220w, so you'll have maximum of 1400w counting with wattage of whole rig, a 1600w can handle 1400w easily
But 1600w is awesome to handle with the optmized settings for your rig, each 3070 will use 130w, so it's 780w + motherboard, CPU etc - 830w