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The Truth about Temperatures and Voltages - Page 18

post #171 of 599
Quote:
Originally Posted by ChickenInferno View Post
Yes, but remember that at 1.45v you may start to really increase your temps and that can cause more instability. As long as temps are fine and you are completely stable, 1.45v is fine.
Or, you could think of it this way, xxicrimsonixx: as long as it's 100% stable (proved by making the overclock capable of doing tons of stress testing), then it's proof that the temperatures are fine.

However, if you want to do some very extreme benchmarking or a suicide run to get a crazy CPU-Z validation, then you can go over 1.45V. Just don't use 1.45V or more every single day.
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post #172 of 599
Thread Starter 
I went ahead and cleaned up the OP tonight. Tried to make it easier to read and redid the graph so it no longer has arbitrary units on the X-Axis, but while I was doing that I got something really sticky on my hand.
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post #173 of 599
Quote:
Originally Posted by ChickenInferno View Post
I went ahead and cleaned up the OP tonight. Tried to make it easier to read and redid the graph so it no longer has arbitrary units on the X-Axis, but while I was doing that I got something really sticky on my hand.
IT'S A STICKY!! W00T!!!!

Nice work on the OP too!
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post #174 of 599
Nice sticky


OK, my thoery about temperature and power consumption is false. Increase in temperature does lower the chip's efficiency, but does not bare a wieght on power consumption like I thoerized. Saw this on a review at Tom's hardware "P=C·V²·f". Power= Capacitance*Voltage²*Frequency. No where in that equation is temperature mentioned.

Some nice info here.

Quote:
The dynamic power (switching power) dissipated by a chip is C·V2·f, where C is the capacitance being switched per clock cycle, V is voltage, and f is the switching frequency,[1]. As frequency changes, the dynamic power will change linearly with it
Quote:
The efficiency of some electrical components, such as voltage regulators, decreases with increasing temperature, so the power used may increase with temperature.

Check this out to: Source
Quote:
It should also be noted that high GPU temperature led to high power consumption. When CPUBurn and ATITool were run with the system fan at 7V, the power draw read 208W initially. The power gradually increased as the card heated up, eventually reaching a plateau of 220W. This is increased occurred because the power efficiency of voltage regulators (and other components) on the board decreased as they became hotter. That's extra incentive to keep your graphics card cool.

And more: source
Quote:
The efficiency and capacity of electronic components such as capacitors decreases as temperature rises. At high loads with real applications inside a real chassis, a PSU gets hot and its efficiency tends to decline.

So temperatures have an effect on capacitance in P=C·V²·f. Changing the "efficiency" is the capacitance. "The chip's inefficiency" The missing value in Intel's data sheets we discussed earlier.



BTW, I also figured out how to get SpeedFan to show distance from TJmax. Note: if you use this you do not have to make the -10C adjustment for TJmax.
    
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post #175 of 599
Quote:
Originally Posted by TwoCables View Post
Or, you could think of it this way, xxicrimsonixx: as long as it's 100% stable (proved by making the overclock capable of doing tons of stress testing), then it's proof that the temperatures are fine.
It's proof that temperatures are stable, but not proof that they are safe in the long term.
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post #176 of 599
Quote:
Originally Posted by Blameless View Post
It's proof that temperatures are stable, but not proof that they are safe in the long term.
An unstable overclock with low temps is more harmful than a 100% stable one (as proved with extreme testing) that has high load temps. Besides, only stress testing will get the temperatures too high for comfort.

So, we all worry way too much about temperatures.
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post #177 of 599
OK, my thoery about temperature and power consumption is false. Increase in temperature does lower the chip's efficiency, but does not bare a wieght on power consumption like I thoerized. Saw this on a review at Tom's hardware "P=C·V²·f". Power= Capacitance*Voltage²*Frequency. No where in that equation is temperature mentioned.

Some nice info here.


Temperature is a byproduct of power. Or is it a byproduct of inefficient power use? Just like power supplies have an efficiency rating, the power not used is converted to heat. (side question.... will a 100% efficient power supply give off no heat? (personal answer is no but lets not debate this one)). Pizza the theory is just backwards, increased power = increased temperature. This is true in almost all electronics, and most mechanical devices as well. Run a car at higher RPM's and it runs hotter, fans run hotter when at a higher speed setting than lower, CPU is the same more power = more heat. I think your thought process got reversed is all. It all makes perfect sense (when reversed).

In other news I have gotten no word back from Intel on their ATX Amp and if it is dynamic or not (go figure). May end up hooking a voltmeter to the 12v leads on the main 24 pin power connector and watch it there. There are also those Amp meters that you put the hot wire in the loop and it reads amps off that wire. May isolate that one and try that method also. Kind of worries me jamming a Amp meter into my 24 pin power, the loop method is less intrusive.

Brian
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post #178 of 599
You should change the title to "the facts" instead of the truth..
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post #179 of 599
Quote:
Originally Posted by FSF-Foxhound View Post
You should change the title to "the facts" instead of the truth..
Good idea.
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post #180 of 599
all the time I spent looking for information about temps and it was right here all along. Too bad I didn't find it months ago.

Nice Guide, Chicken. TY

Quote:
Originally Posted by blkrnbw
Temperature is a byproduct of power. Or is it a byproduct of inefficient power use? Just like power supplies have an efficiency rating, the power not used is converted to heat. (side question.... will a 100% efficient power supply give off no heat? (personal answer is no but lets not debate this one)). Pizza the theory is just backwards, increased power = increased temperature. This is true in almost all electronics, and most mechanical devices as well. Run a car at higher RPM's and it runs hotter, fans run hotter when at a higher speed setting than lower, CPU is the same more power = more heat. I think your thought process got reversed is all. It all makes perfect sense (when reversed)
It is my understanding that CPUs are 0% Efficient as they do no real work and all the energy put into them is lost as Heat. As a side point, or a point of curiosity, here is the answer to a Post I made when I asked to understand why, contrary to Ohm's Law, temperatures decreased as voltages decreased.
Edited by grishkathefool - 8/29/09 at 8:22pm
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