well, if you do get that liquid cooler, or a good air cooler, you can overclock. however, you dont really need too. you can try it to see if it will raise your fps, but i doubt it cuz it is already fast enough for most games. you overclock it in the bios, and i forgot to mention that when you rais the multiplier, you usually have to raise the voltage aswell, but i would recommend you dont touch the voltage yet, and when you do, only by a little, like raise it by 0.025 for every 1 you raise your multiplier. or, better yet, google how to overclock the i5 4670k and follow others instructions. however, it is likely you will make the system go unstable from going too high and windows wont boot. all you have to do then is lower everything back down a bit. worse case scenario, you raise it so much your computer wont even load the bios, and you will have to open your case and reset the cmos (look in mobo manual for that). i suggest you not overclock unless it significantly increases your performance, and if you do do it with caution.