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CPU temperature massive spike under load

post #1 of 12
Thread Starter 
I think I know the cause behind this, but I want to confirm.

When the CPU is idle, the temperature is quite stable - somewhere 35C. But within 2-3 seconds of full load testing, the temperatures spikes to 60C and stays there. Its not a gradual increase like I had expected. The temperature literally skyrockets within sometimes even 2 seconds of full CPU load. The weird thing is, after the load is eliminated, the temperatures plummet back down to about 45C in about 3-5 seconds at which point, it slowly returns back to normal.

Should I be worried? Or is this behaviour normal? If not, my guess is that I put too much TIM. As in WAAAAAAAAAAAY too much...
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post #2 of 12
That would be my first guess, too. Second guess would be too little, but I have no evidence to support that theory.
post #3 of 12
Thread Starter 
Quote:
Originally Posted by audioxbliss View Post
That would be my first guess, too. Second guess would be too little, but I have no evidence to support that theory.
Oh there is no way I put too little... I just don't have the time to reseat the CPU until end of June - I have my exams and stuff...

Is this bad for my CPU?
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post #4 of 12
sounds like a faulty program or just as stated before to much/ to little tim, try a different temp program, what program are you using?
    
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by banging34hzs View Post
sounds like a faulty program or just as stated before to much/ to little tim, try a different temp program, what program are you using?
Openhardwaremonitor - it's based on a commercial software for which I forget the name.

Speedfan also reports the same temperatures.
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post #6 of 12
best i can suggest is resetting it with less/more tim depending on the amount you used, suggest the grain of rice method.

I know that your in school so my suggestion for doing it would be disassemble it at night get up long enuff before class and re-apply tim and reassemble then test after class or what ever would suit your time frame.
    
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by banging34hzs View Post
best i can suggest is resetting it with less/more tim depending on the amount you used, suggest the grain of rice method.

I know that your in school so my suggestion for doing it would be disassemble it at night get up long enuff before class and re-apply tim and reassemble then test after class or what ever would suit your time frame.
That probably won't work that well for me. I need that computer to be up and running with as little downtime as possible. I'm probably going to end up leaving it until June...
The computer actualy doesn't experience a whole lot stress so I think it'll be fine for the next couple weeks... The only stress is a little occasional gaming....
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post #8 of 12
It only takes a few mins to reset the cooler. Its taking in off and cleaning it up and reapplying the tim. It should take no more then 10 mins. And that is your total down time, not to sound like a jerk but you will spend more time reading this tread and responding then just reseting you cpu cooler.

I run a i5-2500k and my temps go from idle to 50-52 in about one second and drop back down to idle in a matter of a second or two. I'm running my cpu under water and I have high ambient temps. So I would say that it is fine. As long as your temps are not really high then you are fine.
Edited by leichtwork - 5/13/11 at 12:34am
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post #9 of 12
You should not be worried. The spike is due to neither an improper seating of your CPU nor using too much TIM. Rather, the sharp rise represents the 'reaction' time of the cooling system, IMHO.

A CPU is an electronic device that can go to full load 'instantaneously' when it is stressed by a software. A typical cooling system simply cannot respond fast enough to such a high rate of thermal output.
A heatsink-fan system dissipates the heat from the cores -->IHS -->thermal paste-->heatsink base-->heatpipes-->fins-->air/fan. This thermal path takes a few seconds.

See the graph below. It shows a cooling system based on a temperature-controlled water chiller cooling an i7:-
1st stage: There is sharp spike of about 17C within a few seconds when the CPU is full loaded. Rate of thermal output from CPU just overwhelms the rate of dissipation of the cooling system.

2nd stage: Then, for the next minute of full load, temp rises about 8C. Temp continues to rise because there is still a thermal inequilibrium But it is not rising as fast as before because the cooling system has passed the initial reaction time and is kicking in to dissipate the heat at a faster rate. Rate of thermal output is constant from the CPU. The rate of dissipation is picking up. Ultimately, given enough time, the curve would level off when the rate of thermal output equals the rate of dissipation. But, of course, this is not shown in the graph.

3rd stage: When the software stops full-loading the CPU at t = 2 minute mark, a sharp drop of about 17C occurs. This happens within a few seconds as well. Basically, t1 = t2 = reaction time of the cooling system.

4th stage: Within the next minute, it drops about 7C and fairly much returns to the prior temperature of 42C.

I hope this gives you some peace so that you can concentrate your mind on your school work.

Edited by windfire - 5/13/11 at 12:36am
post #10 of 12
Yea i have to agree with leicht on this, shouldn't take no more then 20 min's tops to reset the cpu.
    
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