High CPU usage leads to increased temperatures.
High CPU usage leads to increased temperatures.
70 is acceptable, staying below 75°C is secure. If the stock cooler isn't delivering sufficient cooling, consider switching to a different cooler (I've used the stock one on my i5 4690K and boosted it to 3.9GHz).
Alright, so anything under 80°C is acceptable. TJ Max sets a basic limit; once it's hit, your CPU will begin reducing performance. I tested my 4670k for eight hours at an average of 80-83°C and it handled it without throttling. TL;dr, you're good. Your hero cooler is working.
When temperatures hover near 70°F it should be okay. To maintain a cooler environment dust your case if necessary. Reduce the room temperature. Alternatively, purchase an aftermarket cooler. I personally use the CM Hyper 212 EVO and my temperatures stay below 55°C during gaming. It cost about $30.