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The Truth about Temperatures and Voltages - Page 10

post #91 of 599
Quote:
Originally Posted by ChickenInferno View Post
Just remember that the farther you are away from TJ Max (Dist to TJ Max=65 for 25C for us) that the readings are more and more innaccurate.
so how would you find out the exact TJ Max?
    
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post #92 of 599
Quote:
Originally Posted by Flatliner View Post
so how would you find out the exact TJ Max?
You will not be able to. Each chips TJmax is slightly different.
    
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post #93 of 599
Thread Starter 
There isn't a true way to find the exact TJ Max. It is different on every single CPU, but there targets are always the same for each model CPU. Some people swear by the calibration method shown in the first post, but remember that the larger Dist. to TJ Max is, the more error and uncertainty so calibrating to the idle temp can be extremely unreliable.

As for me, I put my TJ Max at what they set their targets on and just leave it. As long as my Dist to TJ Max greater than 20 I am happy (30 would be very conservative).

...The only way to technically find the true TJ max for certain would be to raise the cores temp until the distance to TJ Max was 0, at that temp (that you are somehow measuring) on the cores is the TJ Max....that's not really something I advise...at all.

Edit: 1600 posts yummy.
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post #94 of 599
Thread Starter 
Bump so more people will read.
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post #95 of 599
The OP of this thread should be considered Required Reading here on Overclock.net.
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post #96 of 599
Quote:
Originally Posted by ChickenInferno View Post
Another interesting idea is that the thermal specification (Tcase) may increase as the Power increases linearly. In fact for the Q9000 series, T=0.28P+44.8 where T is Temperature in degrees C and P is Power in watts. Source Page 79
Was reading your thread today and I noticed this^^^ I've personally been pondering a thoery the past week or so.


Theory: It's not particularly temps or voltage that degrade/kill a CPU, but excessive power consumption. It's a proven fact that the hotter a component runs the more watts it uses. Just like the graph on page 79 shows how many watts are being used at a certain temperature. q9000 for example with stock voltage and 71C it uses ~95w. So when you increase the voltage the chip will use more watts at a lower temp. Thus limiting the OC. This is why we have to run our chips cooler in order to OC them further. Cooler temps means lower power comsumption.

The graph on page 79 is not saying that Tcase limitation is increasing, it's saying that power compumtion of 95w will be reached at 71C with VID vcore assuming that Intel used a chip's VID in lab tests.

I can prove or disprove this theory if I can find a way to monitor CPU power comsumption by either amps or watts. If I can find a way I plan to put the stock cooler back on and OC as far as it will go and be stable. If my thoery is right It should use very close to the same amount of watts as it does now with my currant aftermarket cooler OC'd as far it it can go.



Remember, this is just my theory. I welcome input.


EDIT: Oh and I'm not saying that 95w is the maximum power consumptiong for a q9000 proc. It's prbly a very conservative number from Intel. Intel would prbly never tell us a real answer anyways.
Edited by PizzaMan - 8/14/09 at 10:43pm
    
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post #97 of 599
When the voltage and temperature are in safe ranges, the thing that degrades a CPU is using an unstable overclock for any length of time - especially the kind that's stable enough to let you do the things you do every day, but not stable enough to pass proper stress testing.

So, the theory is cool, but I want to try and show you that with all settings at safe values (including temperatures), instability is what degrades a CPU. Intel has stated this, and I posted it above. I have to go take care of something that's cooking on the stove, but I'll come back and find the quite and post it.
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post #98 of 599
My theory doesn't change the fact that instability will kill a chip. My theory is that excessive power consumption will cause instability. An instabilty that is directly linked to temperature and voltage.

I agree, running a chip with not enough voltage and unstable is not good. The electrons are not making it withing the 5% limit to give accurate readings for 0 and 1.
    
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post #99 of 599
Quote:
Originally Posted by PizzaMan View Post
My theory doesn't change the fact that instability will kill a chip. My theory is that excessive power consumption will cause instability. An instabilty that is directly linked to temperature and voltage.

I agree, running a chip with not enough voltage and unstable is not good. The electrons are not making it withing the 5% limit to give accurate readings for 0 and 1.
Oh well yeah: of course. Even Intel says what you're saying, so your theory is absolute fact. Damn, and you didn't even have to read the same document that I had to read to figure this out. Wth. lol Nice brain work, dude.
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post #100 of 599
Well, this makes me want to be able to monitor my chips amps and/or watts even more now.

BTW, please link me if you can.
    
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