Seasonic has recently upgraded their power calculator tools, including the AMD radeon RX 7000 series, which has not yet been released However, it is not known whether these power information comes directly from AMD.
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Both RX 7900 XT and 7800 XT are listed as requiring 750W power supply, while for RX 7700 XT, 650W power supply is recommended. These values are consistent with the corresponding radeon RX 6000 model.
According to the recently disclosed information, the rDNA 3 architecture of these new graphics cards is expected to improve the performance by 40%. Amd confirms that their goal is to improve the performance / watt by 50% compared with rDNA 2.