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Vcore ≥/≤ Temperature - How does it work ?

post #1 of 30
Thread Starter 
So this been on my mind for a few days now - Could I Google an answer ? Probably, but after a few "guides" and threads I dont really see my question answered thoroughly.

I been under the belief (And still am) that when it comes to a CPU there are two major limits - Temperature and Voltage.

Taking my CURRENT system into consideration (Will receive my LD next week and some hardware, X79 etc., the week after) I am running the 3770K on water - For giggles I tried to up the voltage until I hit my TEMPERATURE wall (Well knowing I was "Oh-Gosh-Breaking-The-Law-Of-Overclocking-Lulz!"). After I de-lidded my CPU I can actually hit 1.65-1.70Vcore before the temperature gets to 90C in a stress-test. But I also been informed that the "Max Vcore limit" is anywhere from 1.45 to 1.55 (I love educated "Guesses").

Basically, I can take my Vcore higher than what is deemed "safe" and still keep temperatures in check.


So what I was basically wondering about (TLDR) is, why would anyone run Phase 24/7 ? I know all CPUs are different, but if I hook up a Phase to a 3930K (Without ever tried, yet, so my whole rant here might be about to be shot horribly down) I will hit the Voltage "Safe" limit WAY before I even scratch at a temp that will raise even a flicker of a raised eyebrow.

What is this "magic" that apparently keeps the smoke inside the machine when running at HIGH Vcore at LOW temperatures ?
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post #2 of 30
Two reasons:
  1. You can hit higher clocks with the same voltage
  2. The "safe" voltage limit moves higher as the temperature drops

On water with a 3770K, I'd be comfortable with up to 1.6V for low load testing (Super Pi, 3D03, etc.). Even if my temperatures were around 50°C-70°C, I would not run more than 1.55V for high load testing (Vantage CPU test, WPrime, etc.).
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post #3 of 30
Look at it like this. If you have a bookshelf where you can put 50Kg on it. It will not brake when you put 60Kg on it, but it may break sooner.

Same goes for voltage. Ok your temp is fine, but your giving it too much Voltage... It can be that it will/remain work(ing) but it also can kill it instant or after a period of x time...

Thats the degradation part...

I do believe this, but I wouldn't worry about it that much as temp is more destructive than voltage (in normal conditions)

So best is to keep them both down, but this is OCN right? --> indeed, bump that voltage and keep it cool biggrin.gif
   
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post #4 of 30
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post

Two reasons:
  1. You can hit higher clocks with the same voltage
  2. The "safe" voltage limit moves higher as the temperature drops

On water with a 3770K, I'd be comfortable with up to 1.6V for low load testing (Super Pi, 3D03, etc.). Even if my temperatures were around 50°C-70°C, I would not run more than 1.55V for high load testing (Vantage CPU test, WPrime, etc.).

I see, so basically it boils down to a Voltage–temperature relationship and the fact that Voltage just get far easier "Work conditions" when colder.

Looking forward to see what the LD Phasechange can do on the 3960X I have on my way aswell ( It is an ES that I got DIRT CHEAP (300 USD) , so might as well experiment).

Thanks for the answer smile.gif
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post #5 of 30
Quote:
Originally Posted by Gomi View Post

I see, so basically it boils down to a Voltage–temperature relationship and the fact that Voltage just get far easier "Work conditions" when colder.

Looking forward to see what the LD Phasechange can do on the 3960X I have on my way aswell ( It is an ES that I got DIRT CHEAP (300 USD) , so might as well experiment).

Thanks for the answer smile.gif

Exactly. That's why chips don't die (immediately) when you give them 1.90V at -190°C.

As long as your SS is powerful (and LD makes great stuff), you should be able to hit your max clocks on X79. It should only require ~1.65V or so and will most likely be between 5.2GHz and 5.6GHz.
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post #6 of 30
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post

Exactly. That's why chips don't die (immediately) when you give them 1.90V at -190°C.

As long as your SS is powerful (and LD makes great stuff), you should be able to hit your max clocks on X79. It should only require ~1.65V or so and will most likely be between 5.2GHz and 5.6GHz.

you sir are a gentleman and a scholar!

Will see where my new adventure takes me smile.gif
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post #7 of 30
Be sure to keep us updated!
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post #8 of 30
I thought it was simply that higher heat = higher electrical resistance ...
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post #9 of 30
Quote:
Originally Posted by alancsalt View Post

I thought it was simply that higher heat = higher electrical resistance ...

That is why you can't hit higher clocks, for sure. I'm not quite sure what you're responding to, though redface.gif
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post #10 of 30
Responding to
Quote:
What is this "magic" that apparently keeps the smoke inside the machine when running at HIGH Vcore at LOW temperatures ?
Nyarlathotep
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Nyarlathotep
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Cxaxukluth
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Yog-Sothoth
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OCZ Vertex 4 SSD Seagate Barracuda 1TB ST31000524AS Lite-On IHAS124 24X DVDRW 3 x XSPC Rasa 750 RX360 Universal CPU Water Coo... 
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3 x EK-FC780 GTX Classy - Nickel Windows 7 Professional x64 3 x Dell U2412M SilverStone 1500W V2.2 x 2 
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Lian Li Pitstop T60 Testbench 
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i7 - 5960X Asus Rampage Extreme V Gigabyte Titan X 12GB G.SKILL Ripjaws 4 series 16GB (4 x 4GB) 288-Pin... 
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Microsoft Wireless 3000 Silverstone ST1500 Antec Eleven Hundred Microsoft Wireless 3000 
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Overclock.net › Forums › Cooling › Specialized Cooling › Phase Change › Vcore ≥/≤ Temperature - How does it work ?