And ohm's law doesn't apply why? Sent from my iPhone
> On Jun 19, 2015, at 1:23 PM, Richard Pieri <richard.pi...@gmail.com> wrote: > >> On 6/19/2015 11:02 AM, Steve Litt wrote: >> Today I have a 16GB RAM box, with dual core CPU (I wanted things to >> stay cool), > > I think I recently mentioned buying a new notebook. If I didn't, well I am > mentioning it now: a Mythlogic-branded Clevo P750ZM. It has a Core i7-4790K > processor. You read that right: a 15" notebook with a socketed Devil's Canyon > i7 desktop CPU. I think I have some grounds for saying that limiting yourself > to 2 cores is a poor way of managing heat. > > AMD and Intel processors draw substantially more power than they actually > need. Every processor is different and the minimum stable power varies so > they ship with the stock power draw set high enough that all processors in a > series will run stably. Excess power turns into waste heat. This is why my i7 > quickly reaches 99C under load and throttles if I don't do something about it. > > That something is called undervolting. As the name suggests it means reducing > the voltage that the processor draws. Since every processor is a little > different there is no single ideal undervolting setting. Finding the ideal > for a given processor requires some trial and error, same as overclocking. A > common starting point for Haswell i7 processors is -80mV dynamic CPU voltage > offset and -100mV processor cache voltage offset. My 4790K barely reaches 80C > with Intel XTU's stress test with these settings. That's the same as the > i7-4790S at 3.2GHz (what the notebook originally shipped with) while running > 20% faster at 4.0GHz. I figured that was good enough and called it done. > > -- > Rich P. > _______________________________________________ > Discuss mailing list > Discuss@blu.org > http://lists.blu.org/mailman/listinfo/discuss _______________________________________________ Discuss mailing list Discuss@blu.org http://lists.blu.org/mailman/listinfo/discuss
