53 degrees Celsius is too hot. Electronic components start to drift at around 42-43 degrees Celsius, this is the gold in the microprocessors starts to expand more than what is allowed by the specs of the casing.
Normally you have heatsink to prevent that, but this doesn't work up to really high temperature and may even inhibit it.
So at around 42 C the gold expands and the electronic signals take slightly more time to transfer (it may help to understand that electricity does not travel at the speed of light. It is actually quite very slow). At temperatures of mid 50s the metal may have expanded to the point of not being able to contract back to normal (stretch). At temperatures of above 60 C, the gold contacts may break, causing what is commonly referred to as burnout.
The moral of the story is cooling it down may return it to normal if it wasn't past the manufacturers specifications, but there is a point of no return and you would always see a degradation in performance.
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