u could do 5ghz if u are in Siberia or some ware else were u could do sub 0c by being outside, anythig near room temp on the stock cooler i wouldent expect over 4ghz with turbo and thats pushing it. the stock cooler is not upgraded to an OEM cooler to be quiet sure u could use it to be quieter but thats only since it has way more cooling power and surface area so u dont as high RPMS to get the air flow that u need but thats not to say that u cant shove some deltas onto a good cooler and get even better cooling