system
A chat on subreddit /r/pcmasterrace
human
 2x 4090 = 900 Watts

1x CPU (I'll assume a 3970X or 3990X, as TR Pro has the ram and socket sideways, that or an equivalent intel) = 280 Watts

1x Mobo, hard drives, and peripherals (not including monitor(s)) = \~50watts

total estimated system power draw under full load = Post PSU draw \* \~1.1 (90% efficient) = 1230 \* 1.1 = 1353 watts

for context most US space heaters draw between 800-1400 watts.
gpt
The maximum wattage a standard circuit in NA is rated for continuously is 1440 watts, lol. That PC is crazy!