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For many modern CPUs, running at 40 - 50°C with the fan at 0 RPM (not spinning) can be safe,when the temperature rises above the set threshold (in this case, above 40 - 50°C), kicking the fan on is a good strategy to actively cool the CPU.
NVMe drives generally have a certain tolerance for temperature. At passive/0 RPM (assuming no active cooling dedicated to the NVMe drive), they can operate within a reasonable temperature range. Most NVMe drives are designed to handle temperatures up to around 70 - 80°C. However, high - performance NVMe drives that are under heavy workloads may heat up more quickly. In a passive - cooling scenario, if the temperature of the NVMe drive gets too high, it can lead to performance degradation and potentially reduced lifespan.
RAM modules also have a temperature range in which they operate optimally. They can usually handle temperatures up to around 80 - 90°C. In a passive - cooling setup, as long as the ambient temperature and the heat generated by other components (such as the CPU and GPU) don’t cause the RAM to overheat, they should function fine.