How low can you go?

james1701

Golden Member
Sep 14, 2007
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After fighting with my processor to get the highest oc I can get and raising voltage's, I decided just to set it at 3ghz and leave it. Then I decided to see how low I could go with the voltage. I found that I could clock a 333 fsb, and still get everyt thing to run with it set to 1.21 volts. I was amazed to see a sub ambient temps with my TR 120 EX. I then set it to 1.25 volts, and with cpu-z, my volts read 1.184 underload, and with prime95 running on all 4 cores, and set for maximum heat, after 2 hours my temps are only 45C. How low is everyone else running their Vcore?
 

BoboKatt

Senior member
Nov 18, 2004
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I had the exact same thought and experience. After trying to get that last elusive 200mhz etc out of my G0 Q6600 I just gave in to a 333FSB, a cool 3.0Ghz and set my Vcore to 1.265 or 1.2675 or whatever the one is higher than 1.25. I also use the TR 120 EX and my temps rarely if ever get over 42-43 now on the main core. The other 3 cores run cooler. I can play for hours and hours and again it stays cool and quiet. I never figured I could go any lower on Vcore... in fact I am almost sure that when I did try a lower setting, I crashed out of prime95. Then again on my Asus P5K-E wifi, the only thing I changed from auto was the FSB and the vcore... nothing else so maybe I could tweak that a bit and maybe be able to lower the vcore.

 

BlueAcolyte

Platinum Member
Nov 19, 2007
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It could be possible, but very difficult, seeing as the nanosecond power hits your CPU, it heats up.
 

Idontcare

Elite Member
Oct 10, 1999
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Originally posted by: BlueAcolyte
It could be possible, but very difficult, seeing as the nanosecond power hits your CPU, it heats up.

No it is impossible, regardless the power loading scenario you try and concoct.

The reason it is impossible is that heat flows to equilibrate temperatures. If you are using the ambient air, which is by definition as being at ambient temperature, to cool a CPU then at best the CPU itself can be cooled to be at ambient temperature.

Now you could use the wrong temp measuring program, which misreads your temperatures or miscalculates them based on a faulty assumption of your CPU's Tcase or Tjunction and it could report to you (in error) that the CPU temps are below ambient...but rest assured you have not created a special universe inside your computer case where the physics of this universe no longer apply.

Note: sub-ambient temps are possible when the cooling technique employed is something other than using ambient air to cool your CPU...as in vapor-phase cooling.
 

Billb2

Diamond Member
Mar 25, 2005
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Originally posted by: BlueAcolyte
It could be possible, but very difficult, seeing as the nanosecond power hits your CPU, it heats up.
Could you explain that a little further..........

 

MarcVenice

Moderator Emeritus <br>
Apr 2, 2007
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Ah I should have said, it's inpossible to get it below ambient temps using aircooling that simply pushes air at ambient temperature. Just think about it, if your PC is not powered up, even with the biggest fan blowing at it, how is it going to get cooled below the ambient temperature? Heat can only be transfered if there is a discrepancy between the temperature of two objects, in this case the heatsink attached to the cpu, and the air being blown through. If there is no difference, how is heat going to be transfered, making your cpu cooler then the ambient temperature. And, since it does heat up the moment energy runs though it, it's going to be even more inpossible to cool it below ambient temperatures using aircooling.
 

sharad

Member
Apr 25, 2004
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1.22v is the lowest my board (Abit IP35) allows me to go. My 6600 overclocked to 3Ghz just by changing the FSB from 266 to 333Mhz. I have a Thermalright 128-SE cooler with Panaflo H1BX fan (undevolted) and Prime95 load temp is ~ 53-55C at around 24C ambient.
 

Billb2

Diamond Member
Mar 25, 2005
3,035
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Originally posted by: MarcVenice
If there is no difference, how is heat going to be transfered, making your cpu cooler then the ambient temperature.
Wind Chill?
Don't answer that.............

 

eelw

Diamond Member
Dec 4, 1999
8,993
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At stock speeds, I got my Vcore down to 0.96v stable for my Q6600. But I still prefer my Vcore at 1.42v with it running at 3.6GHz.
 

Dainas

Senior member
Aug 5, 2005
299
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I can do 3.1ghz at 1.18v stable (stock), but run 1.25v at 3.22ghz. Temps stay at 104f/40c with my tuniq 120 with all cores flat out SMP folding with the room 68f/20c with the motherboard utility. I have Vista x64 and a USB keyboard, so its impossible for me to run coretemp on this machine and see the individual temps :p
 

aigomorla

CPU, Cases&Cooling Mod PC Gaming Mod Elite Member
Super Moderator
Sep 28, 2005
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Originally posted by: Billb2
Originally posted by: BlueAcolyte
It could be possible, but very difficult, seeing as the nanosecond power hits your CPU, it heats up.
Could you explain that a little further..........

ummmm..... you have dice or LN on your chip b4 it powers up? :)


Rules of thermodynamics can never be YMMV!!! [Your Milage May Vary]

Cooling besides the form of sub ambient cooling which require energy being put back into the system to pull heat out, is the only way you'll get sub ambient.

even when your comp is off, the only temp your chip can go is ambient.
 

james1701

Golden Member
Sep 14, 2007
1,873
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Or it could be a cold duct run outside, with the other 8 120mm fans, on a Thermalright 120E, I can get sub ambeint temps.
 

DSF

Diamond Member
Oct 6, 2007
4,902
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Originally posted by: james1701
Or it could be a cold duct run outside, with the other 8 120mm fans, on a Thermalright 120E, I can get sub ambeint temps.

Outside? Like outside the house? Or outside the case?

Ambient temperature is usually defined as the temperature inside the room, not of the air inside the case.
 

F1shF4t

Golden Member
Oct 18, 2005
1,583
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1.325 volts at 3ghz and 1.375 volts at 3.15ghz (as in sig) P95 stable. If I waited a week I could have gotten a G0 instead of this heater.
 

LOUISSSSS

Diamond Member
Dec 5, 2005
8,771
54
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Originally posted by: Dark Cupcake
1.325 volts at 3ghz and 1.375 volts at 3.15ghz (as in sig) P95 stable. If I waited a week I could have gotten a G0 instead of this heater.

DEF worth the wait...