Any GP104 Pascal GPU and thus GP104 based graphics card is rated as having a 180 Watt TDP under full stress, our measurements back that up albeit are roughly 10% higher due to the faster clocks and thus voltage usage. Anyhow, at this performance level you are looking at a card that consumes roughly 400~450 Watts for a stressed PC in total, that is okay. We think a 500~600 Watt PSU would be sufficient and if you go with 2-way SLI say an 750 Watt power supply is recommended.
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