I connected the power supply fan through reobas. What threatens me?

Question

Power Supply

I replaced the cooler in the power supply https://www.citilink.ru/catalog/computers_and_note... with Zalman https://www.ulmart.ru/goods/224560 and connected it via reobas https://www.citilink.ru/ catalog/computers_and_note...
In the middle position of the reobas (I don't know how many revolutions), the computer is almost silent, the cooler is spinning.
The air comes out a little warm from behind, there are no suspicious smells. =)
What threatens me with a small load (software, office work)?
If there is still not enough cooling, will the PSU burn out immediately or will it turn off first, for example?
What is the probability that when dying, the PSU will take some more iron with it?
How can you track that the PSU is overheating if there is no sensor?
From energy consumers: 2xSSD, 2xHDD (as storage, almost never used), vidyaha.