I managed to overclock 3570k with stock cooler to 4.1 ghz and temp in somewhat CPU dependant games is hovering
73 ,76,76,73 I know its bad temp ,but just how bad really ? I will get a better cooler later.
With the Intel® Core™ i5-3570K your temperatures are not dangerous but I would really work to lower them. Adding a cooler like the Cooler Master Hyper 212 Evo can really help the temperatures without costing an arm and a leg.