I have an asrock z77 extreme4 and i have OC'd my i5 3570k to 4.2ghz on stock cooler.. max temp on prime95 goes to around 70 degrees celcius maximum. I have found a good voltage for 4.2ghz but i heard that it's better (can someone explain why) to just change the multiplier. I can't find any settings to change the multiplier though. I tried increasing the bus speed but that led to windows not being able to start. Also is LLC ok on auto? Which level would be better. I am also waiting for my evo 212 cooler to come for more ocing thanks
More aboutchange multiplier
with overclocking you have a base clock and a multiplier if you increase the base clock it raises the cpu frequency and your ram frequency as they are linked with miltiplier overclocking you leave the base clock the same and increase the cpu frequency by increasing the x multi leaving the ram alone with my 2550k im running 100 base clock and 48x multiplier to achieve 4.8ghz so for 4.2 you will be running at 42x. try increasing the multi and voltages, prime95 it to check for stability and load temps
OC tweaker > cpu ratio. LLC on auto should be fine for this speed.