Temperature confusion

M

matoind

Discoverer
I just bought a used Coolermaster N620. Initially, the temp used to shoot to 90 Deg C at 3.4 Ghz when using Realtemp and prime 95. At 3.5 Ghz it used to reach Tmax of 0. My ambient temp is 29 Deg.

Then I lapped my Heat Sink. Now I get about 80 Deg C at 3.6 Gigs. But the most surprising part is that the temp barely touch 85 Deg at 4.1 Ghz.

Does the heat transfer become more efficient when the heat increases. Or is there something that I am overlooking.
 
No heat transfer becomes more efficient when you fixes the intermediary between the processor and the heatsink. Which is probably what happened in ur case .... when you lapped ur heatsink and reapplied thermal paste, more heat got transferred to the cooler which led to the temp drop.
 
RD274 said:
No heat transfer becomes more efficient when you fixes the intermediary between the processor and the heatsink. Which is probably what happened in ur case .... when you lapped ur heatsink and reapplied thermal paste, more heat got transferred to the cooler which led to the temp drop.
Click to expand...
But the rate of increase in Temp does not correspond to the increase in Clock rate! Within 5 Deg at 0.6 Gigs increase in OC
 
My system is MOBO P55-GD80, i7 860, Cooler Coolermaster N620, Cabinet HAF 922.

The article was quite informative, but heat transfer formulas are beyond me. But in layman language (I think), the heat transfer will improve when the difference between the ambient temp and Heat Sink is high. So at lower frequencies the proccy temp increases rapidly, but at higher freq., the speed of increase of temperature reduces.

My idle temp is around 44-45 Deg. Peak is at 86 Deg (in one core - Others are aound 80). Should I clock higher? What will the safe temp be?
 
maybe you didnt have to increase voltage a lot to get 4.1 ghz from 3.6 ..... so there wasnt that much more heat generated. Temps wise you are at the max really not recommended to push anymore without better cooling.
 
matoind said:
My system is MOBO P55-GD80, i7 860, Cooler Coolermaster N620, Cabinet HAF 922.

The article was quite informative, but heat transfer formulas are beyond me. But in layman language (I think), the heat transfer will improve when the difference between the ambient temp and Heat Sink is high. So at lower frequencies the proccy temp increases rapidly, but at higher freq., the speed of increase of temperature reduces.

My idle temp is around 44-45 Deg. Peak is at 86 Deg (in one core - Others are aound 80). Should I clock higher? What will the safe temp be?
Click to expand...

Those are high temperatures. Try to lower the vCore. Are you sure you are on the absolute lowest vCore.

You have to aim for this combination.

Highest frequency + Lowest vCore + Lowest thermals + Stability.

Are you checking the system for stability.
 
Yes, I am checking for stability. I just have to lower the Vcore since it is automatically increased by the Mobo. The max temp mentioned are when running realtemp+Prime.
 
Difference of 40 degrees between idle and load points to poor selection of cooler which is unable to handle the heatload well. You have to look at a different cooling solution, or lower the heatload. For a modern processor that dynamically adjust clocks and voltage, you are looking for between 25 and 30 degree delta at the highest safe voltage and clocks you are comfortable with, personally I'm not comfortable with over 20 degrees delta. Your absolute temperature is also a cause for concern, unless you run mostly at lower loads and see peak temperatures only occasionally.

We normally put all the operating points on a graph, plotting clock speed against voltage, with a sharp red line where the temperature limit is (usually 80 degrees, maybe 5 degrees more if you live in an exceptionally cold place). The line flattens (i.e. not much increase in clock with increase in voltage) at a point, the long-term stable operating point is usually chosen where this transition is seen - as long as it is below the safe temperature limit. That is the only way you can reach a conclusion on what you should actually run at.
 
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