A fire risk? I think it'd be exceptionally rare for that kind of thing to lead to a fire instead of just dead parts (assuming no overtemperature protections). Even people with the 600 w melting GPU cables don't end up with an actual fire.
Batteries, however, are absolute hellfire when they go wrong (because of chemistry - not just the temperature).
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Every old hardware needing a fan is also a silent fire risk.
A fire risk? I think it'd be exceptionally rare for that kind of thing to lead to a fire instead of just dead parts (assuming no overtemperature protections). Even people with the 600 w melting GPU cables don't end up with an actual fire.
Batteries, however, are absolute hellfire when they go wrong (because of chemistry - not just the temperature).