I did a quick test with my setup and workflow:
MacBook Air 8GB/8-core GPU/512GB. Apps used:
- Final Cut Pro rendering one of my YouTube videos
- This is 1080p 60fps video being exported as H.264 video (final size ~7GB)
- I don't use 4k video format (yet)
- Safari playing some 4k videos
- Normally I wouldn't play 4k videos when my FCP is exporting, but do browse some sites, but for this instance I am playing 4k videos to showcase memory used
Results are below - At all times, the machine never got warm and the machine was not connected to power source either. It seems like its still not getting to 8GB for me, but sure If I was to use PhotoShop or play more 4k videos, it would certainly hit the memory threshold - but why would I do that? - that would only make sense for testing though.
To me personally, this is extraordinary that M1 chip is able to drive this workload. It makes it significantly better than my 2017 MBP 15" 16GB/2GB GDDR5 machine which is not only 2 minutes slower to render the same video in FCP, the machine gets insanely hot with fans spinning in high speed!
Memory used when FCP exporting video with two 4k videos playing in YouTube in Safari
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Memory used when FCP exporting video with one 4k videos playing in YouTube in Safari
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Memory used when only FCP exporting the video
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