Someone did a shunt mod (no idea how that works) and attached a 2nd 12v-2x6 connector to their GB Aorus RTX 5090. It turns out GB made the board with 2 12v-2x6 position and just populate one of them depend on the model of card. The modder added a 2nd connector to the board and switch to watercooling since the original cooler no longer fits. Result is meh since it's similar to a regular watercooled + OC card.
videocardz.com
Modder runs RTX 5090 at 800W+ using two 16-pins connectors and shunt mod on Gigabyte card - VideoCardz.com
Gigabyte RTX 5090 modded to support two 12V-2×6 power connectors Although we talk a lot about 12V-2×6 power connectors in terms of their issues with thermals and often melting, some users aren’t as concerned about such issues. In fact, they would rather add even more power if they could...