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How do people generally refer to CPU temperatures?

post #1 of 20
Thread Starter 
Every time I read a review of a cooler, or see someone talking about their temperatures, I can never figure out if they're referring to the tcase temperature of the tjunction temperature. This is a bit of a problem because of the disparity between these two values, often by almost 10C.

So, I want to clear this up once and for all: What temperatures do people both here on OCN and in general in reviews around the interwebs refer to when they talk about CPU temperatures?
Edited by shinigamibob - 4/18/11 at 9:31pm
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post #2 of 20
Core temps.
post #3 of 20
Thread Starter 
Quote:
Originally Posted by gymenii View Post
Core temps.
I'm assuming this means the Tjunction temperatures. Damn... if this is the case, I'm going to have to reseat my cooler. I'm supposed to be getting around the high 20's temperatures, instead I'm getting mid to high 30's. Thanks for the input

+rep
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post #4 of 20
Your specific temps can also differ based on your ambient as well as case flow, not just seating/TIM. You might want to check the ambients in the reviews you're looking at as well.
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post #5 of 20
Quote:
Originally Posted by shinigamibob View Post
I'm assuming this means the Tjunction temperatures. Damn... if this is the case, I'm going to have to reseat my cooler. I'm supposed to be getting around the high 20's temperatures, instead I'm getting mid to high 30's. Thanks for the input

+rep
Tjunction measures processor core(s) temps. Tcase or CPU temp is the temp of the processor's HS, with no physical diode measurement, not very accurate at all and most just ignore it.

As far as why your temps are not what you expected.... double check how you mounted the HSF, how much TIM you used, and of course, your ambient temps.
post #6 of 20
check for dust too , thats caused issues for me!
 
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post #7 of 20
Thread Starter 
Quote:
Originally Posted by gymenii View Post
Tjunction measures processor core(s) temps. Tcase or CPU temp is the temp of the processor's HS, with no physical diode measurement, not very accurate at all and most just ignore it.

As far as why your temps are not what you expected.... double check how you mounted the HSF, how much TIM you used, and of course, your ambient temps.
Exactly my thoughts too - I know my Archon is capable of really low temperatures, so I'm just wondering what gives.
TBH though, this was my first build, and I have a bad feeling that I put waaaaaaaaaaay too much TIM. I remember my hands were shaking like crazy when I putting on the paste, and instead of a pea sized amount, a whole glob just kinda came out. I should probably clean that up and try reseating.

Thanks for the info
+rep

Quote:
Originally Posted by TitaniumClocker View Post
check for dust too , thats caused issues for me!
Dust is not an issue - I built this baby less than 2 months ago.
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post #8 of 20
Quote:
Originally Posted by shinigamibob View Post
Exactly my thoughts too - I know my Archon is capable of really low temperatures, so I'm just wondering what gives.
TBH though, this was my first build, and I have a bad feeling that I put waaaaaaaaaaay too much TIM. I remember my hands were shaking like crazy when I putting on the paste, and instead of a pea sized amount, a whole glob just kinda came out. I should probably clean that up and try reseating.

Thanks for the info
+rep


Dust is not an issue - I built this baby less than 2 months ago.
If you are like me getting old and forgetful, you will soon not remember which is which (Tjunction or Tcase).
But, in general, you just use the temp reading which is higher of the two (ie disregard the lower reading). As temp is highest at the heat source (ie the Core), one should always (if possible) use that as the reading of concern.
post #9 of 20
Thread Starter 
Quote:
Originally Posted by windfire View Post
If you are like me getting old and forgetful, you will soon not remember which is which (Tjunction or Tcase).
But, in general, you just use the temp reading which is higher of the two (ie disregard the lower reading). As temp is highest at the heat source (ie the Core), one should always (if possible) use that as the reading of concern.
How about this then: On stock vcore at 3.8Ghz up from 3.06Ghz, the highest core is idling at 44C, the others at 43C. I've seen the Archon get significantly better temperatures than that. What do you think the cause of this might be?
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post #10 of 20
Quote:
Originally Posted by shinigamibob View Post
How about this then: On stock vcore at 3.8Ghz up from 3.06Ghz, the highest core is idling at 44C, the others at 43C. I've seen the Archon get significantly better temperatures than that. What do you think the cause of this might be?
1C Idle temp difference among the cores?
Typing mistake? If not, this is very good.

I think it is better to test the Archon with the CPU under full load condition. And remember the general rule of thumb about the effect of ambient temp on CPU Load temp: for every 1C ambient temp rise, there is about 1.4C rise in CPU Load temp. Use this to make adjustment when comparing to other people's result.

And if you really want to compare Idle temp, make sure all cores are really idling. Check Task Manager to ascertain all cores are 0% usage. And, make sure you have same Energy Saving settings as others because downclocking can make a difference.

Also, putting other things aside and only considering the temperature factor, applying too much TIM would not bring a much higher temperature. If the mounting screws are tightened to give proper pressure, any excess paste will simply be squeezed out.
To check for an adequate amount, just remove the heatsink and visually inspect the spread pattern. If it is evenly distributed, then it is good. Do it once or twice and you will know the right amount.
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