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How did i not just kill my CPU!!!! - Page 4

post #31 of 37
Quote:
Originally Posted by SystemTech View Post
OOOH my word, i just realised, that my pump was not running in my loop and it had been on and folding(100% usage on all 4 cores) for the last 24 hours. I am not to sure exactly when my pump stopped woring but it did.

It turns out it was just a lose connection in the molex connector because as i fiddled with it the pump came on and my temps instantly dropped in 20*c heaps. I obviously stopped the folding app.

Just look at the CPU max temps :0


I could feel the water in the pipes right there was pretty much boiling.
CPU's are much more tolerant to temperatures than most people think. I'll never understand the obsession with people here, thinking that unless you have your CPU at room temp +5C, it will suffer some drastic failure because of the temps.

I won't argue that I wouldn't run a CPU at that temp for it's entire lifetime, but it shouldn't really cause any real damage to it, even if it ran for a few days at 100C. The sockets are tested/rated at 115C+ for 50 hours. Max suggested temp for the CPU from AMD is like, what, ~65C? Means the cores are probably near 75C. No idea how much a temp increase impacts the lifetime of a CPU, but doubtful that a couple days at 105C would kill a CPU. Now, if it were overvolted, then that's a different story.
    
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post #32 of 37
Quote:
Originally Posted by linkin93 View Post
It's a good thing water conducts heat better than air...
Both open air and an active water loop utilize convection to transport heat away. When the pump is off, the water loop relies mostly on conduction....
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post #33 of 37
@DuckieHo:

Things of being a dumbass. I kept resetting my computer because the memory settings were unstable... And on one of those resets I forgot to re-plug my bomb.

And then... FATAL1TY...
   
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post #34 of 37
Quote:
Originally Posted by DuckieHo View Post
Both open air and an active water loop utilize convection to transport heat away. When the pump is off, the water loop relies mostly on conduction....
Point is, if he had air in his loop I doubt his CPU would be alive. even still water moves heat better than air
post #35 of 37
Quote:
Originally Posted by DuckieHo View Post
Both open air and an active water loop utilize convection to transport heat away. When the pump is off, the water loop relies mostly on conduction....
Not exactly. Small temperature differences in the water still cause it to move around; it's just not observable to your eye. The primary mode of heat transfer is still convection; it's just that the convection coefficient is drastically lowered when the water is still vs. moving.

That's why with a thermos the insulating space has to be a vacuum or a very, very tiny sliver of air. If the insulating space is filled with air and allowed to be just a little too big, convection forces would take over and it wouldn't be nearly as effective.

That's why when we look at heat transfer we generally sum up all fluids under "convection", with moving/non-moving fluids being classified under forced/non-forced convection. The difference between forced/non-forced convection is huge, though.
post #36 of 37
Quote:
Anyone else find it odd that all his cores have the exact same readings?

Not at all. There are no seperate core sensors. AMD processors report the temperature via a special register in the CPU's northbridge. Core Temp reads the value from the register and uses a formula provided by AMD to calculate the current temperature.
The formula for the Athlon 64 series, early Opterons and Semprons (K8 architecture) is: 'Core Temp = Value - 49'.
For the newer generation of AMD processors like Phenom, Phenom II, newew Athlons, Semprons and Opterons (K10 architecture), and their derivatives, there is a differnt formula: 'CPU Temp* = Value / 8'.
The sensor in AMD CPUs can report temperatures between -49C and 206C.
*CPU Temp is because the Phenom\\Opteron (K10) have only one sensor per package, meaning there is only one reading per processor.
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post #37 of 37
Because you didn't run it for a long time.
4-year build.
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4-year build.
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