The design choice on the Nitro + was to go the 12V-2x6 connector direction due to the aesthetics of the card. The TDP of the GPU is lower than that of what the cards from Nvidia draw. If you study the connector itself, it helps resolve power input onto a small patch of the PCB. The design of the connector is still in question for Nvidia due to the melting connectors(courtesy of the power draw on their high end cards) but the cards AMD have released(at the time of this writing 9070/9070XT) are lower in terms of power draw but on par with the RTX5070.