Non-gaming power consumption of RTX 3090 is a bit high even compared to RTX 3080, which is surprising because both are based on the same GPU chip.
During gaming, power consumption of the ASUS STRIX is around 335 W. Surprisingly, this is below the other RTX 3090 graphics cards we have tested today, and those cards don't run as fast. ASUS possibly only uses better binned GPUs with better efficiency characteristics for the STRIX. While the heatsinks and coolers on the 3090 are massive and ensure these chips are properly cooled, you also have to consider that all this heat is going into your room.
Wow, Furmark maximum power almost hits 450 W. That said, this won't be a problem because of the card's 3x 8-pin power inputs.
Recommended PSU: 800 W