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Gamers Nexus did some power efficency numbers on this new card:

It was fine when playing games (windows), totally comparable to AMD/Nvidia,

it did poorly at idle (30+ watts).

According to TechPowerUp, idle power is absolutely fine, but only if you enable ASPM: https://www.techpowerup.com/review/intel-arc-b580/38.html

I guess GN did not enable ASPM?