Power/heat tests:
Overall very quiet and does well at removing heat. Most backwards compatible games run 160-170w even at 120fps while Gears 5 peaks around 210w. Here is a comparison to the One X which ran much slower.
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It's pretty good. I do wonder how things will look with demanding next gen games though. Same with the PS5. Both consoles seem designed to handle heat so I imagine they'll be fine, but I am curious.