TechHead87
Senior member
Has anyone ever done it? Does it help reduce CPU temps?
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This may sound wierd...
- Thread starter TechHead87
- Start date
RichUK
Lifer
yes but why would you want to reduce cpu temps, of course if you reduce clock speed and Vcore then you will have a reduced heat output, but that would just be ghey and a waste of money .. is there a reason for you to ask this ??
EDIT: just noticed you have a P4 3Ghz i can see why you would need to reduce heat output now, most be pretty toasty in your room 😛
for ur mobo? the p4p800, and 3.0 p4??
why int he world u wnana do it?
im guessing you have the prescott version which is giving u high temps. but as long as its 45 or less, its fine. at load, i might go up to 55, which is still OK.
underclocking shouldnt be a problem, but remember u will be underclocking ur ram too. i just dont see a need. run it at stock...its all good.
why int he world u wnana do it?
im guessing you have the prescott version which is giving u high temps. but as long as its 45 or less, its fine. at load, i might go up to 55, which is still OK.
underclocking shouldnt be a problem, but remember u will be underclocking ur ram too. i just dont see a need. run it at stock...its all good.
TechHead87
Senior member
No real reason....just a wondering mind. With everybody overclocking (this increasing temps), I was wondering if anyone ever 'under'clocked a cpu/mobo/anythingelse, and if so, if it actually reduced their temps from where the temps were before...
Jeff7
Lifer
Yes, I did this already in my Scanner PC project. Tbred 1700 clocked to 1GHz (5.0x200), at the lowest voltage the motherboard would allow. It did drastically lower the heat output of the processor, but of course the speed was also cut down a good bit.
That was for a unique project though. What do you seek to accomplish with reducing your CPU temp?
Cooler room? Longer CPU life? In either of those cases, the CPU isn't the only thing putting out heat - and CPUs already last many many years.
That was for a unique project though. What do you seek to accomplish with reducing your CPU temp?
Cooler room? Longer CPU life? In either of those cases, the CPU isn't the only thing putting out heat - and CPUs already last many many years.
freethrowtommy
Senior member
I remember seeing a project going over this vs. the performance, but I can't remember where I saw it. From the conclusion tho, it wasn't worth it since you lost a good amount of heat but the performance dropped off even quicker.
Elcs
Diamond Member
If you consider how much heat a modern system can throw out at maximum load, a system may make the room hot or run too hot itself. Most of us dont have a problem with this because we're a bit exotic with cooling or have already prepared for such a contingency whether specifically or by just covering another problem.
My T'Bred B 1700+ was running at 2.2ghz @ 1.70vcore actual. Ive dropped it to stock just to stop it pushing out so much heat. Im not gaming heavily recently apart from GTA:SA and the graphics suck there.... and my pc is used as a server to my dads pc to provide the internet connection.
Id underclock if I was unhappy with the heat output during the summer, Im actually tempted to do it.
My T'Bred B 1700+ was running at 2.2ghz @ 1.70vcore actual. Ive dropped it to stock just to stop it pushing out so much heat. Im not gaming heavily recently apart from GTA:SA and the graphics suck there.... and my pc is used as a server to my dads pc to provide the internet connection.
Id underclock if I was unhappy with the heat output during the summer, Im actually tempted to do it.
Jeff7
Lifer
It can be much like overclocking - lower the speed by a few multiplier levels, and reduce the voltage to the lowest the board will allow. Then reduce the CPU speed, test it with Prime 95, and repeat until the CPU won't go any lower without causing errors.
But how much does the CPU itself contribute? Now we've got 7200rpm+ hard drives, powerful motherboards, graphics cards that have more transistors than a fast CPU, and bigger power supplies to run all of it. And underclocking will only reduce the heat output of the CPU - it won't eliminate it.
Rock Hydra
Diamond Member
My mobile barton goes down to like 400 something MHz
Powermoloch
Lifer
Are you a mad 😱 !!!! just j/k 🙂
It is possible, I seen ppl did it, they are happy w/ it.
BillyBobJoel71
Platinum Member
45 is not bad for a prescott... somewhere around my idle temps, but haven't checked in a week.
Elcs
Diamond Member
The CPU is probably still the biggest outputter of heat especially a Prescott. AMD64's may be a lot closer to equalling a high-end graphics card in terms of heat output. This is pure speculation on my part.
If CPU's arent the main culprit of heat output, then why do they have the bigger heatsinks? CPU real-estate is less restricted than a graphics card but I believe my point to be a rather valid one.
The CPU is gradually losing its dominance as the main heat producer as cores and cpu production processes mature and the GPU's make their own impact, especially in SLI systems. As every aspect of our PC's evolve, heat is becoming a problem for almost all parts. We're just going to have to all live in the Arctic until they melt then we develop waterproof PC's.
Suspicious-Teach8788
Lifer
Check out XtremeSystems. They have an EXTREME Undervolting section so you can get a better idea of what you want. It's not about underclocking.. it's about undervolting. MHz does not produce heat. Voltage does. Thus you need lowest voltage/highest performance balance if you wnat to reduce temps.
Zap
Elite Member
IIRC, 600MHz (100x6), though that may just be what it defaults to.
Overclockers.com had an article about this:
"Power-Optimizing The Intel Pentium M Laptop"
Funny, an article about underclocking on an overclocking site, haha. I actually have tried this on my laptop and have had good results. My 1.6GHz Dothan can be clocked to 800MHz minimum at around .75v (no way to lower mobo FSB of 133 unless I do a permanent pin mod). I think I saw a spot estimate of over 7 hours battery life, and I actually did use my notebook almost five hours (web browsing, watching anime).
If not doing anything extreme, can probably do a few simple steps to lower temps a bit while not losing much performance. A64 users have the option of cool and quiet. Intel P4 users can lower voltage if the motherboard supports it, if not then can lower mult/vcore and raise FSB. Athlon XP users (depending on core and mobo) can lower voltage, lower multiplier, raise FSB.
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