overclocking i5-3570k and temperature problem

I recently purchased Noctua NH-D14 cooler for my Intel i5-3570k CPU for overclocking purpose. I used to overclock the CPU every now and then and also liked to change all its settings. Recently I put everything back to stock and noticed that the temperature was almost the same which used to be at the time of overclocking. The idle temps remain at 38C but when I am playing any games then it crosses to 62C and this was the same figure I used to get while overclocking the CPU and monitoring by HWmonitor. Does anyone know how to fix this problem? Thanks