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I’m running ~30 containers, but they don’t typically all get new updates at the same time.
Updates are grabbed nightly, and I think the most I’ve seen update at once is like 6 containers.
Could be a problem for setting up a new system, or experimenting with new toys.
That is one beefy fan for a rpi.
I’ve just got a case similar to this; but all snap together, no screws:
The fan runs off the pin headers. Meant for 5v, but I use the 3.3v line to run it a little quieter/slower.
Even that makes a good 10°c difference.