My Latest experiment!!!!Under volting CPU!!!!

Sam RuleZ · 13-11-2006, 02:30 PM

Hey guys,
My CPU running at the stock cooler used to touch 61 degs at full load, it's a ClawHammer 1.8GHz......the Stock voltage was around 1.5+ volts.....as I'm running at stock....I thought to under voling the CPU to bring its temps down!!!

But my BIOS didn't let me control my vCore...damn!...So after a lot of googling I found a software called...''Crystal CPUID''..after downloading it....I set the vCore to 1.4!!!! yeah! ..

And this seems to be Stable....at least at Prime95....

And now let the pics do the talking...

Before the temps were like 60-61!!!!!....

And my question is....

1) Should I continu with this setting.??? If its stable.?
2) Can this damage anything/??
3)Can I drop the vCore to 1.3xx????

**Strider** · 13-11-2006, 03:07 PM

Quote:

Can this damage anything/??

To best of my knowledge under volting does not affect the CPU life time. Anyway it'll not cause a quick damage. But we can't say what will happen in a long run. If your PC is stable then it's ok.

deathvirus_me · 13-11-2006, 05:37 PM

Hmm .. the whole thing seems a bit odd ... coz my 3500+ used to run at ~1.4V at stock ... and 3200+ run at ~1.35V .. 2800+ running at ~1.5V stock is wierd ... sure ur mobo is doing ok ??

Anyway .. undervolting will not damage the CPU instantly ... well infact forcing anything within limits will hardly damage it instantly .. infact u should have noticed that ur current CPU voltage varies constantly ... use speedfan to monitor it a bit. .. my CPU is oc'ed and load voltage varies from 1.45V to 1.525V ... thats quite a big range , i know , but i have the CPU voltage set to "auto" from the bios ... what i notice is that the voltage stays under 1.5V in 2D mode , temps around 40c ... and under load goes to around ~1.525V , with load temps hardly crossing 50c ...

What i mean is , every thing has a rating to run at .... less power can result in redundant clock cycles .. and though ur system may run absolutely stable , u might lose out on performance ..

So for all ur queries i've got one answer : enable Cool'n'Quiet .. that should sove ur problem .. let that do what if finds is the best ....

Sam RuleZ · 13-11-2006, 06:30 PM

Quote:

Hmm .. the whole thing seems a bit odd ... coz my 3500+ used to run at ~1.4V at stock ... and 3200+ run at ~1.35V .. 2800+ running at ~1.5V stock is wierd ... sure ur mobo is doing ok ??

That's coz I have a 130nm chip...where as you got a 90nm chip....

Quote:

nyway .. undervolting will not damage the CPU instantly ... well infact forcing anything within limits will hardly damage it instantly .. infact u should have noticed that ur current CPU voltage varies constantly ... use speedfan to monitor it a bit. .. my CPU is oc'ed and load voltage varies from 1.45V to 1.525V ... thats quite a big range , i know , but i have the CPU voltage set to "auto" from the bios ... what i notice is that the voltage stays under 1.5V in 2D mode , temps around 40c ... and under load goes to around ~1.525V , with load temps hardly crossing 50c ...

my BIOS dosen't have any option to control the vCore......I use Crystal CPUID for changing the vCore.....And yeah...if I set it to 1.4v then it varies from 1.4~1.49~........

Quote:

What i mean is , every thing has a rating to run at .... less power can result in redundant clock cycles .. and though ur system may run absolutely stable , u might lose out on performance ..

yeah! I still have to do a few benchies!

Quote:

So for all ur queries i've got one answer : enable Cool'n'Quiet .. that should sove ur problem .. let that do what if finds is the best ....

but C&Q helps only when Idle.....but at load it runs at 60..

And finally!

How vCore do I require for a 130nm ClawHammer @1.8GHz??????

Sam RuleZ · 13-11-2006, 08:09 PM

UPDATE

Just did a few benchmarks and there is no performance diff......And the default recommended is 1.5v......I'm running at 1.4v...So...what do you think?

24 · 13-11-2006, 08:39 PM

If it makes your Chip run cooler than stay with the 1.4v, i can't see why Undervolting a CPU could damage it, that too with overheat, play your cards safe, run 3D Mark 05 and 06 at lowest possible resolution (640x480 or 800x600) again and again, Loop it allnight i say, if the CPU is stable than no need to switch back to 1.5v

Sam RuleZ · 13-11-2006, 09:49 PM

^^
Thanx dood!....

But I will run Prime 95 2morro or whenever I get some time.....I think I'll run it for about 5hrs...should do....

But isn't there anyway to keep the vCore 1.4v.....as my BIOS doesn't have an option...
The software that I use....loses its settings after re-booting...

...

Another thing......My mobo doesn't have PCI/AGP locks.....this software "Crystal CPUID'' let me control the multiplier to any one!!!

Should I try 10*200??????? So as the FSB is the same...I will not need any dividers nor locks!

deathvirus_me · 13-11-2006, 10:32 PM

DO NOT INCREASE THE MULTIPLIER ON nonFX ATHLON64's ... they simply do not support it .. ...

Also .. the voltage fluctuates between 1.4 and 1.49(~1.5) .. so i think that apllication did do much of a trick than just to reduce idle voltages ... hmm ...

Do you have any option to set a target temp. for the CPU in the bios ??

Sam RuleZ · 14-11-2006, 10:31 AM

The vCore is set to 1.4 and is ~1.46......max.....it between 1.44~1.46....

Quote:

Do you have any option to set a target temp. for the CPU in the bios ??

Nope

Sam RuleZ · 14-11-2006, 04:12 PM

**UPDATE!!!**

Hey guys,
.............It finally worked!!!!!! .....I just created a Shortcut to 1.2v from Crystal CPUID...and pasted it into the startup folder...

....

Prime95 is running from 4hrs.,,,and Super Pi 32M test also passed!!!!..

Load temps dropped from 61 to 46....yeah! 15 degs

And idle temps from 45 to 39-40!...

THANX GUYS!!!!

Opps ....almost forgot!!

The results

And I would encourage everyone who has the same prob....if his/her system can run with at vCore.. i.e

13-11-2006, 02:30 PM	#1
Sam RuleZ Senior Member (500+) Join Date: Jun 2006 Location: Mumbai. Age: 16 Posts: 505 Thanks: 6 Thanked 27 Times in 22 Posts Rep Power: 17	My Latest experiment!!!!Under volting CPU!!!! Hey guys, My CPU running at the stock cooler used to touch 61 degs at full load, it's a ClawHammer 1.8GHz......the Stock voltage was around 1.5+ volts.....as I'm running at stock....I thought to under voling the CPU to bring its temps down!!! But my BIOS didn't let me control my vCore...damn!...So after a lot of googling I found a software called...''Crystal CPUID''..after downloading it....I set the vCore to 1.4!!!! yeah! .. And this seems to be Stable....at least at Prime95.... And now let the pics do the talking... Before the temps were like 60-61!!!!!.... And my question is.... 1) Should I continu with this setting.??? If its stable.? 2) Can this damage anything/?? 3)Can I drop the vCore to 1.3xx???? __________________ "Its better to get burnt, than to fade away"-Kurt Cobain. Last edited by Sam RuleZ; 13-11-2006 at 02:52 PM.

13-11-2006, 05:37 PM	#3
deathvirus_me Senior Member (500+) Join Date: May 2006 Location: Bhatpara , India Age: 22 Posts: 830 Thanks: 1 Thanked 28 Times in 24 Posts Rep Power: 18	Hmm .. the whole thing seems a bit odd ... coz my 3500+ used to run at ~1.4V at stock ... and 3200+ run at ~1.35V .. 2800+ running at ~1.5V stock is wierd ... sure ur mobo is doing ok ?? Anyway .. undervolting will not damage the CPU instantly ... well infact forcing anything within limits will hardly damage it instantly .. infact u should have noticed that ur current CPU voltage varies constantly ... use speedfan to monitor it a bit. .. my CPU is oc'ed and load voltage varies from 1.45V to 1.525V ... thats quite a big range , i know , but i have the CPU voltage set to "auto" from the bios ... what i notice is that the voltage stays under 1.5V in 2D mode , temps around 40c ... and under load goes to around ~1.525V , with load temps hardly crossing 50c ... What i mean is , every thing has a rating to run at .... less power can result in redundant clock cycles .. and though ur system may run absolutely stable , u might lose out on performance .. So for all ur queries i've got one answer : enable Cool'n'Quiet .. that should sove ur problem .. let that do what if finds is the best .... __________________

13-11-2006, 08:09 PM	#5
Sam RuleZ Senior Member (500+) Join Date: Jun 2006 Location: Mumbai. Age: 16 Posts: 505 Thanks: 6 Thanked 27 Times in 22 Posts Rep Power: 17	UPDATE Just did a few benchmarks and there is no performance diff......And the default recommended is 1.5v......I'm running at 1.4v...So...what do you think? __________________ "Its better to get burnt, than to fade away"-Kurt Cobain.

13-11-2006, 09:49 PM	#7
Sam RuleZ Senior Member (500+) Join Date: Jun 2006 Location: Mumbai. Age: 16 Posts: 505 Thanks: 6 Thanked 27 Times in 22 Posts Rep Power: 17	^^ Thanx dood!.... But I will run Prime 95 2morro or whenever I get some time.....I think I'll run it for about 5hrs...should do.... But isn't there anyway to keep the vCore 1.4v.....as my BIOS doesn't have an option... The software that I use....loses its settings after re-booting... ... Another thing......My mobo doesn't have PCI/AGP locks.....this software "Crystal CPUID'' let me control the multiplier to any one!!! Should I try 10200??????? So as the FSB is the same...I will not need any dividers nor locks! __________________ "Its better to get burnt, than to fade away"-Kurt Cobain.*

14-11-2006, 04:12 PM	#10
Sam RuleZ Senior Member (500+) Join Date: Jun 2006 Location: Mumbai. Age: 16 Posts: 505 Thanks: 6 Thanked 27 Times in 22 Posts Rep Power: 17	UPDATE!!! Hey guys, .............It finally worked!!!!!! .....I just created a Shortcut to 1.2v from Crystal CPUID...and pasted it into the startup folder... .... Prime95 is running from 4hrs.,,,and Super Pi 32M test also passed!!!!.. Load temps dropped from 61 to 46....yeah! 15 degs And idle temps from 45 to 39-40!... THANX GUYS!!!! Opps ....almost forgot!! The results And I would encourage everyone who has the same prob....if his/her system can run with at vCore.. i.e __________________ "Its better to get burnt, than to fade away"-Kurt Cobain. Last edited by Sam RuleZ; 14-11-2006 at 07:13 PM.

13-11-2006, 08:39 PM	#6
24 Regular Member (100+) Join Date: Nov 2006 Posts: 217 Thanks: 1 Thanked 17 Times in 14 Posts Rep Power: 5	If it makes your Chip run cooler than stay with the 1.4v, i can't see why Undervolting a CPU could damage it, that too with overheat, play your cards safe, run 3D Mark 05 and 06 at lowest possible resolution (640x480 or 800x600) again and again, Loop it allnight i say, if the CPU is stable than no need to switch back to 1.5v

13-11-2006, 10:32 PM	#8
deathvirus_me Senior Member (500+) Join Date: May 2006 Location: Bhatpara , India Age: 22 Posts: 830 Thanks: 1 Thanked 28 Times in 24 Posts Rep Power: 18	DO NOT INCREASE THE MULTIPLIER ON nonFX ATHLON64's ... they simply do not support it .. ... Also .. the voltage fluctuates between 1.4 and 1.49(~1.5) .. so i think that apllication did do much of a trick than just to reduce idle voltages ... hmm ... Do you have any option to set a target temp. for the CPU in the bios ??

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