Setting the thermal limits below stock (95°C) make no difference, since the boost algorithm already uses lower limits.
The original limits for Ryzen 3000 SKUs were:
- 3600 = 4100MHz (80-95°C) / 4200MHz (< 80°C)
- 3600X = 4200MHz (80-95°C) / 4400MHz (< 80°C)
- 3700X = 4200MHz (80-95°C) / 4400MHz (< 80°C)
- 3800X = 4300MHz (80-95°C) / 4550MHz (< 80°C)
- 3900X = 4400MHz (80-95°C) / 4650MHz (< 80°C)
Since then, it appears that the HighTemperature limit has been reduced further to 75°C (from 80°C).
New SMUs also have introduced "MiddleTemperature" limit, but that gets disabled when PBO is enabled.
HWInfo is also able to display these limits (fused values).