THIS! But, it's a refurb, so minor blemishes are normal.Dude that bites. Contact EVGA again and state that this replacement is not only cosmetically damaged but cannot power the system properly. Don't forget to mention that you have a different EVGA model that is 150w less and powers the system fine. Ask them to explain themselves there. What wattage rating system are they using?
Rattle the cage enough and you could get a new GQ or a different series. Also mention that you shouldn't be forced to pay shipping again for their faulty refurb.
EDIT: Been thinking about this... I wonder what the issue is... like, does EVERY RTX 3070 owner have this issue? I'd guess not or we'd see a lot more complaints??? No idea. Weird that a 1KW PSU can't handle this card. You said it did previously for a while, right?