If you keep the voltage at 1.2 you should be able to get 4.0-4.2 out of the stock cooler safely enough.Haven't overclocked the 3570k (or the 6770), and I have 16gb ddr3 so that shouldn't be an issue for a long while lol. CPU is 3.4 with 3.8 'turbo' so I was hoping it'd be enough without needing to overclock, but I guess there isn't any real reason not to. I know it won't be very much but I need to see how far I can safely push it with stock cooling.