currently i've oc my e7200 to 3.0ghz have done till 3.5 without changing the voltage.
but now my ac isnt working due to some problem with it.. at 3.5ghz its temp is below 50 in full load after running prime95 for 30 min wen in ac with room temp 18..
my doubt is can i take it to above 4.0 ghz with or without over volting but using my same old stock intel cooler... but in the same condition i used for 3.5.. or should i get a new coooler for that??
ohh..i forgot.. i dnt use a cabinet
Intel stock cooler with 4.0 GHz OC will create instability. Cabinet/case or bread-boarded system will not make much of a difference in lowering the CPU temps; at best, the reduction will be marginal because of heat transfer characteristics.
Without an increase in voltage, the CPU will become unstable (4 GHz), and increasing the voltage will raise the temps - no question about this. No, the stock cooler will not be adequate for this type of OC. How much OC will the CPU with the stock cooler handle? Only experimentation will tell. My guess - not 4.0GHz