When Master Lu updated today, the motherboard temperature was 99 degrees, and everything else was normal. Why?

Well, there are two kinds of temperatures, one is Fahrenheit and the other is Celsius. Generally speaking, the daily temperature mostly refers to how many degrees Celsius. For example, the weather forecast says that the highest temperature today is 29 degrees Celsius, so it means 29 degrees Celsius. If converted into Fahrenheit, it looks a bit scary, and 29 degrees becomes 84.2 degrees Fahrenheit. So to sum up, the above-mentioned motherboard temperature of 99 degrees should mean "Fahrenheit". If converted into the usual "Celsius", it is about 37.2 degrees. Therefore, the temperature of your computer motherboard is normal.