Has anyone here done this, especially on a laptop, to reduce heat? Seems to be all the rage on some laptop review forums.
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Endervolting a CPU
- Thread starter Drew99GT
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I dont see how you could undervolt a laptop cpu. The BIOS never has any sort of adjustment. Plus, they already do that anyway, automagically underclocking/undervolting based on load requirements.
Years ago, accidentally, on a Pentium 200MMX. The results were crashes and instability until the CPU voltage was increased to what it should have been.
I have yet to see a laptop that allows you to change the clock speed of the cpu. Up or down.
I've undervolted in conjunction with an underclock, just as you would overvolt with an overclock. The voltage/clock relationship is really more related to heat in the silicon substrate. The hotter it gets, the higher the voltage that must be applied so that the electrons can cross gaps in the silicon, which widen when it gets very warm. With a laptop's limited cooling abilities, it will only get so cool.
I don't know why you would want to do this anyway, since the Pentium M a clock frequency/core voltage modifier has been built into all the laptop chips in some form, and now the newer generations of Desktop CPU do it, too, as well as self-overclocking.
Now, what you CAN do is get a program that will allow you to control the "speed stepping," as it's called, for the processors that are enabled with it. You can tell them to stay at their undervolted/underclocked setting and not increase power in response to processor load, or you can tell them to stay at the max setting if desired. I use EEECTRL for my EEEPC's celeron M chip to do this. I can lock it down to 430 mhz if I need to watch my battery useage, or lock it into high gear if I need to cut lag from something I'm doing.
I don't know why you would want to do this anyway, since the Pentium M a clock frequency/core voltage modifier has been built into all the laptop chips in some form, and now the newer generations of Desktop CPU do it, too, as well as self-overclocking.
Now, what you CAN do is get a program that will allow you to control the "speed stepping," as it's called, for the processors that are enabled with it. You can tell them to stay at their undervolted/underclocked setting and not increase power in response to processor load, or you can tell them to stay at the max setting if desired. I use EEECTRL for my EEEPC's celeron M chip to do this. I can lock it down to 430 mhz if I need to watch my battery useage, or lock it into high gear if I need to cut lag from something I'm doing.
If you realy want a cool running lap-top, from what I have read a solid state main drive would be the way go.
Drew99GT
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I already have my CPU underclocked in half. It's an Intel Pentium 4 M in a Dell Inspiron 5150. This model laptop, especially with the Intel Desktop processor, is known for overheating.
When ambient temps get hot and temps inside my house get into the upper 70s, low 80s, this laptop will still start getting into the mid to upper 50s Celsius when doing processor intense things.
When ambient temps get hot and temps inside my house get into the upper 70s, low 80s, this laptop will still start getting into the mid to upper 50s Celsius when doing processor intense things.
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Drew99GT
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Anyone have a laptop cooler? If so, do they work alright? My HD as well gets pretty hot - into the low to mid 50s Celsius on hot days.
People are also doing it on home servers which run 24/7.
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