No. Do not every overclock ANY CPU with the stock cooler. Especially on an older chipset like that without great VRM heatsinks and only a 4+1 power phase. Even a 4 core chip like the 4300 still needs a better cooler. Granted, 3.8Ghz to 4Ghz isn't much, in fact it's the same as the Turbo core max speed, so overclocking to 4Ghz unless you turn the power profile to 100% minimum in the control panel profile, turn off turbo core in the bios and disable cool n quiet in the bios, there's not much sense in even overclocking it.