ZinaAngel55 That's pretty high if your AIO cooler is as good as you say it is, especially given the power of your processor and the relatively undemanding nature of Sims 4. But it's not dangerous. I'd only suggest you needed to do something if your CPU temps reached 95º or higher.
Having said that, it's possible that the cooler is mounted incorrectly or that it's not getting good contact. If you're comfortable doing so, I'd suggest removing the cooler and having a look. You should only see a very thin layer of thermal paste, if that's what you're using, with the CPU and the cooling plate partially visible. Thermal paste is less efficient at transferring heat than direct metal-to-metal contact; it's there to fill in the microscopic air gaps, not to act as a buffer overall.
Point is, a better mount could help with the temperatures.
Another point to consider is how the radiator is mounted and what fans you're using. Let me know where the fans are (inside or outside the radiator), whether they're intake or outtake, and whether you're using fans that came with the AIO cooler or generic case fans.