i7 7700k Overclocking
i7 7700k Overclocking
It's acceptable for your CPU to stay consistently around 4.515 GHz during non-gaming times, as it can idle at that level. The idle ranges you mentioned (40°C and 65-75°C during games) are typical and normal.
It's safe as long as voltages stay within limits.
The main drawback is a small rise in idle power use.