With a Hyper 212 evo I woudn't try overclocking it to much maybe at most 10% and check your cpu temps, if your computer is above 80 degrees celsius( 194 degrees Fahrenheit) then stop overclocking immediately. Go to your bios first and see your temps before you overclock if it is around 40 - 60 celsius then you are okay to over clock to maybe 5 - 10 %