Besides what GoodPlay mentioned the RX5700 GPU has a Maximum Operating Temperature of 110C. Once it starts to reach or has reached 110C the GPU card will automatically throttle to keep the temperature at or below 110C.
So it is still within AMD GPU Temperature range but close though.
What does AMD Wattman show as far as Temperatures for your GPU card? It is possible Asus is not reading correctly the GPU's temperatures.