500w + is where the OAM format comes in, even data centers with all their advanced cooling and power delivery technologies very rarely push more than 450w on a traditional PCIe interface, it's just too risky.I'm pretty certain the rumors were real. They just couldn't get the cards to reliably draw that level of power without melting and lighting your system on fire. If they could have done it, they would have, and charged us another grand on top of what they're already asking.
https://www.techspot.com/news/96261-nvidia-rtx-titan-ada-reportedly-canceled-after-melted.html