H all,
I undervolt my E6600 @ 2.4Ghz from stock 1.325V to 1.020V with temperature @ 44C full-load with room ambient @ 30C (CPU stress test with orthos > 2hr in progress w/o any error yet); Super PI gave me no impact on the performance. Btw, will undervolt cause any harm to the CPU or other components? Thks in advance~

This post has been edited by sotong168: Sep 10 2007, 01:35 PM


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tat is underclocking...main advantages is to save power comsumption...i do it too...

i don think there is any harm to the processor

underclock = lower than default speeds.
undervolt = lower than default voltages

, used to do it on my Venice E6, instead of 1.4, i use 1.2vCore, damn i love the temp even on stock heatsink, well that's the old story eh...
anyway, there's nothing wrong with undervolting/underclocking, it's just lead to unstable system due to low voltage supplied , correct me if i'm wrong...

@nate_nightroad, as slash mentioned, it is undervolt not underclock and thus i suppose there is no impact on the performance, mind to tell your setup?

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Added on September 10, 2007, 1:44 pmorthos should be able to test on the stablity right? thks~

This post has been edited by sotong168: Sep 10 2007, 01:44 PM

i did mine same as urs which is at 1.020V..but i also underclock mine as well from 2.4 till 1.9...

run steady...can play most of the games(oblivion,nba,fifa,C&C)....

temp i think is around 40+

It is best to test for stability when you undervolt and underclocked. I usually run orthos blend test for 6-12 hours at that underclock/undervolt setting. If it passes, then I would consider the rig 99.99% stable....

I undervolt my laptop. The laptop is now cool enough to be switched on 24/7 with folding@home, without laptop coolers. I think undervolting actually extends the life of the processor, instead of causing damage. I do prime95 for at least 6 hours to determine the lowest stable voltage.

yes its safe but generally it cannot exceed the -10% mark IIRC

I undervolted 22.69%.

Is that referring to the voltage or the speed? I would guess the vcore right?

Should be vcore.

I see. I did do some research on undervolting previously but never came across anything saying that the vcore should not be lower than a certain percentage.

The only thing that was theorectically harmful was for older generation AMD CPUs, something about mem controller shouldn't be less than 0.325v compared with the vcore....

mak aii nicee.....

wan question when the proc in fullload also no problem rite even u undervolt it?if u passed orthos shud be stable.During gaming suddenly hanged or restart wud be annoying

My system have to be rock stable since I do folding@home. If it's unstable, folding will fail. I recommend running 2 instances of Prime95 to test for undervolting stablity.

any differences if i running orthos instead of 2x prime5 as i suppose orthos = prime95 x2.
just now tried 0.88V, the system passed POST but failed to boot-in windows

undervolting recommended for laptop? i've undervolt mine around 15% using NHC - dynamic switching. now my voltage is same with sonoma LV processor. i'm using sonoma 1.86GHz , 533MHz FSB

there was once the laptop crash while on battery, other wise on AC no problems what so ever.
already stress test while on AC for 6 hours, no problem.

how to stress test on battery?

This post has been edited by gary_cheah85: Sep 13 2007, 05:22 PM

yes, i undervolted my T7200 as well and the outcome is impressive, really cooling down a lot than what i expected (i posted the setting & outcome mths ago). crash on battery? could it be just a coincidence?

I'm not so sure about orthos. I've never used it.

My laptop remains stable even it's on batteries. Maybe you should add another notch of voltage for improved stability.

the stock vcore of the e6600 is 0.85 - 1.35

Undervolting has the following benefits
-longer lifespan
-cooler running
-power savings (and electricity bill savings at that )

Only downside is that it might not be stable, but how to check for that is already mentioned here. You can stabilise a undervolted proc by
-underclocking
-increasing the voltage slightly
-cooling it further (not very effective, needs to be subzero for any significant effect)

stock Vcore for my proc is 1.35V. last time with stock cooler, i undervolt to 1.185V, oc to 3.01GHz, stable.

now using TT Big Typ, can oc to3.15GHz, but then need to increase Vcore to 1.225V

still lower than the stock Vcore..

orthos all stable saja, 24/7 running no problem...

if both cpu remain at stock vcore but one is OC (the other one stays at stock clock), will both still have the same temperature and power consumption? thks~

Sorry for my noob question, can I undervolt the proc like e2140 and in the same time overclock the proc?

Since the e21xx series got is a good oc proc, undervolt it and overclock a bit of speed, is it possible??

Possible. The limit of overclocking will then be determined by your Vcore.

Another question,will it be cooler and save more powers?

yes, undervolt & oc gradually and test the stability with orthos

i suppose that is the purpose of undervolt

UNCLOCKING
- confirmed it will reduce LOTS of heat from proc

jz tested using stock HSF on my e6400@2.13Ghz stock spd but undervolt to 0.99v

on TAT,
stock voltage ~68C(idle), load 100% >80C
at 0.99v ~53C(idle), load 100% <65C

close case, in A/C room....dam gd im gonna cont undervolt 24/7 from now on unless i OC

running Opty144 @ 1.30V (stock 1.4V) and push a lil' bit speed (aound 35%) .
stable , lower heat produce .

idle at 68C... very hot temp dude....

Yeah, there's something wrong with your rig. It shouldn't be that hot even in a closed case system. Are you sure the CPU HSF is seated properly and the fan is running?

◎toda6866, RokXIII & kmarc are right, the temp shud not be that "furious" even at stock vcore, hsf & clock, how do u get the readings? is yours es? what about bios readings?

brisbane 4000+ @1Ghz 0.784V, @2.1Ghz (stock) 1.008V. using crystalcpuid, readings by cpuz, ccpuid settings are actually at 0.800V and 1.025V. @1Ghz can go as low as 0.752, but no options on ccpuid. 1 don't like rmclock

turion x2 tl-52 taylor. @800Mhz can go as low as 0.732 using rmclock. but using ccpuid. i tried changing the settings in the ini files and get 0.775V @1.6Ghz 0.85V.

all stable with orthoz.

unfortunately, 2 notebooks and 3 desktop, i only bought an AMD system not that i'm a fan, its just cheaper.

Opty 146
1.16G @ 0.85v [idle]
2.32G @ 1.125v [middle]
2.9G @ 1.4v [load]

using RMClock.

Running at 1.25v ( stock 1.35 ), all good

hi guys, just some update on my undervolted e6600, pairing it with g92 8800gts, during playing cm:dirt, the game hang occasionally, so i increase a bit from 1.020V to 1.075V (stock is 1.325V), the hang issue solved

That is pretty high temp.I oc an E4500 to 3.05ghz(305x10),1.44v i think and load 66C also very scary liao but pass OCCT

should be no problem, my friend undervolt his sempron to 1.1v

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Added on December 18, 2007, 8:41 pmyes.. it is possible, oc a bit only does not effect too much things

This post has been edited by MyCJS01: Dec 18 2007, 08:41 PM

i had try once oc my opty170 from stock 1.35V to 1.2V and oc to 250mhx , 2.5Ghz 1000htt and runnning occt for few hours no problem.
my ram was setting lower to 333mhz rather then ddr400

For those who doens know much about OC stuff....there is a way of Unclocking. wat i did was i enables the Speedstep function in the bios (using Asus P5n-e-sli) and then once i'm in windows, go to the power option in control panel...just choose portable/laptop as ur power scheme...this will lower down everything.

it saves energy, reduce heat productivity and its a instant setting. u can change it back to the default speed at anytime as long as u are in the window

but the downside is that the speed is fixed. E.G i'm using e6420. at Home/office desk setting..it runs at 2.13ghz the default speed, when i change it to protable/laptop power scheme the speed is 1.60ghz.... normally wat i did was i change it to protable/laptop when i'm downloading and then i go to slep

i'm using watercooling for my system.

home/office 2.13ghz 29c 1.300v (LYN & web surfing)
Protable/laptop 1.60ghz 26c 1.138v (LYN & web surfing)

the tempreture will be 2c-3c lower when i'm not using the pc.

This post has been edited by melvyn: Jan 5 2009, 02:48 AM

I doubt underclocking harms the CPU, but if u go too low, u wont have a stable uc/u volt

under volt my e8400, running at stock 3ghz @ 0.976v, idle 32c, load 32c, fanless air-con room, non air-con idle 34c, load 39c
damn satisfy since no need pay so much to tnb

This post has been edited by hengmy: Jan 16 2009, 05:38 PM

Mine must be costing a lot of tariffs then, at 1.58v

Im also under volt, just slightly under volt.
Now running 1.28v on vCore.

my QX9650 on power saving mode undervolt to 0.9276

EIST & C1E turned off and i undervolt my Q9650 to 1.06v load stable

with EIST & C1E disabled = proc can be further undervolted?

u shouldn't disable them. Undervolt is not related anyway but if disable them the frequency increase while idle which consume more electric and generate more heat.
@melvyn
if turn off hdd can download? coz the portable/laptop configuration switch off hdd after 30min right?

wah dug up an old thread, then saw my old post...... >1yr now only i reply again

im using S1283 HSF edi (since last yr i think) so when i was replacing my old intel stock HSF found out i din not press d push pins hard enuff onto d motherbored.....

so dat crazy temp was bcoz of my noobness. if any newbies reading this, pls do take note n dun b so noob like me,


now running 3.2gHz@400fsb /1.26vcore (undervolting but overclocking proc) temp max only 66C running orthos

Lowest i can go with my mobo... in terms of volt.

the best i could do it. IBT 16 tests stable.

May i know,what kind of software u guys use to downlocking/undervolting?

You may reduce the voltage/clock speed settings accordingly in your BIOS and use stability software to test.

I think Fyonne is via bios undervolting. Mine is a combination of bios and windows. Get windows to force speedstep and never let the proc run at 100% capability.

Not sure if it works the same for AMD's technology for power saving.

@Fyonne... wahhh 0.996v... play around with gtls maybe can get it lower abit more?

This post has been edited by cyloh: Mar 29 2009, 07:29 PM

But isnt it troublesome?
Need to restart to set everytime want a powersaving settings.Is there any software to set?
AMD technology is the same,but my mobo doesnt allow it to b enable if im overclocking - -

Nah, in windows 7 it is saved and locked that way. If you want to change the amount of processor % on the fly no problem also.

But since you cannot enable cool&quiet, then I don't know if the OS can help you clock down the clock/volts....

enlight me with it. im still pretty newbie on tweaking stuff other than vCore.

depend on wat mobo u using, my guess is now most mobo came with their own OC program. i usually adjust initial setting on BIOS, n test n set the optimum one slowly thru windows (in this case, im using Gigabyte EasyTune6 that came with my mobo)

In order to use EIST, you have to enable it in the BIOS and turn it on in your OS: http://www.intel.com/support/processors/sb/CS-028855.htm

In your bios should have GTL voltage settings(that depends on what mobo also, not all will have).
Should have GTL1 and GTL2 usually. Set both to 63. Or to the lowest u can set I guess.

Hey if you downclock lower than 3ghz, who knows? you might be able to run your chip 0.8v on 2.5ghz

Anyone knows for a quad core, if you disable Core Multi-processing in bios(become dual core), does it fully shut down
2 cores and therefore saving 50% watts?

When my main rig proc is idling, it runs at 401x6=2.4ghz at 1.03v. My intel board doesnt allow any undervolting beyond the speedstep limits

On my amd rig, at idle it runs at 1.2ghz at 0.8v. At this low voltage state, i've actually locked the multiplier n voltage & stress tested it without the fan running. The proc remained below 60C even after an hour

hahahah

nice2 undervolt can safe money

i duuno when i want to undervolt my proc coz now im really2 got poison to oc

Play oc first, when get bored only undervolt.

I'm curious on phenom's undervolt/underclock ability..... should b way better than intel i'm guessing.

undervolt my E6320 from 1.3375 to 1.25 and overclocked it 3.0GHz. though not that stable but it doesnt have problem for my daily use, gaming also no problem.