The thermal limit for Ryzen processors is 70 degrees Celsius. When you overclock a Ryzen, the temperature increases quickly. If you plan to overclock a Ryzen 5 you need to get a high-end CPU air cooler. I recommend the Noctua NH D15 SE-AM4. Noctua is one of the most respected names in the PC cooling market and the NH D15 SE-AM4 is one of the best air coolers available.