Solved

CPU temperature changes rapidly ONLY under load? help!

Hi guys,
I've replaced my old mobo(Intel made,Celeron single core) with another one(non Intel, local made) it had a pentium D dual core e**** processor on too.
Now, I've installed this mobo(including processor) in my old cabinet. I did not replace the old PSU as I found its better than the one I'm getting.
Also the used my old processor heatsink and fan instead of the new one that the dual core e**** had, because I found the old heatsink I had is actually twice big.

Summery: new mobo with new processor but old PSU and heatsink.

After the surgery, everything worked with only two exceptions;
1. Processor fan spins at full speed, always.
2. Core temperate reporting constant numbers (36c,42c) for both cores but suddenly rises while processor under load also settles down to above mentioned numbers as soon as the cores aren't under load anymore.

HDD temperature seems fine, it increases slowly and stays.

No fan control or rpm report in speed fan.

My old mobo used to show several temperature, I guess my new mobo doesn't have any of those temperature probes.

The processor has inbuilt temperature sensor right? Also why the fan speed is constant?
I know its an essay :D but wanted to give you guys a detailed report.
Your help is very much appreciated
:)
10 answers Last reply Best Answer
More about cpu temperature rapidly load
  1. A Pentium D can generate a lot of heat. You can't determine if a heat sink is efficient by it's size. Use the one that came with that CPU as it may be much better. Apply the correct amount of heat paste whan installing it, i.e., you only need as much as required to fill the voids between the HSF and the CPU.
  2. That is how a CPU works, no problems mon..... temps go up at load and back down when not in use. You get sweaty when you run but you stop sweating when not running anymore.

    As for the fan always running that is either due to a a lack of proper fan controls/settings on your new motherboard or the cooler was not meant to dissipate that much heat so the fan if on auto is always running full blast.
  3. GhislainG said:
    A Pentium D can generate a lot of heat. You can't determine if a heat sink is efficient by it's size. Use the one that came with that CPU as it may be much better. Apply the correct amount of heat paste whan installing it, i.e., you only need as much as required to fill the voids between the HSF and the CPU.

    Agree that pentium generate a lot of heat. But I'm now
    Using the smaller heatsink with my old Celeron and the normal temperature is close to 60c. And if I use that with my pentium then I'm thinkin that's bye bye pentium :D

    Btw when I touch the big heatsink that I'm using with pentium, I don't feel any heat at all while the smaller one on the Celeron is really hot :O

    Anyway the real question is still unanswered, why sudden changes in temp when there's load also how can it jump back to 36c and 42c as soon theres no load ?
    I dont think this heatsink can take heat off from processor that fast ??
  4. spentshells said:
    That is how a CPU works, no problems mon..... temps go up at load and back down when not in use. You get sweaty when you run but you stop sweating when not running anymore.

    As for the fan always running that is either due to a a lack of proper fan controls/settings on your new motherboard or the cooler was not meant to dissipate that much heat so the fan if on auto is always running full blast.


    But not this fast. I mean if I start PS The temperature jumps to 55+ and as son as I close the app temperature returns to 36-40c(each cores). I don't think even liquid cooling can take off that much heat that fast.
    Also the heatsink is cold too when I touch it, when system is running.
  5. christo-tj said:
    GhislainG said:
    A Pentium D can generate a lot of heat. You can't determine if a heat sink is efficient by it's size. Use the one that came with that CPU as it may be much better. Apply the correct amount of heat paste whan installing it, i.e., you only need as much as required to fill the voids between the HSF and the CPU.

    Agree that pentium generate a lot of heat. But I'm now
    Using the smaller heatsink with my old Celeron and the normal temperature is close to 60c. And if I use that with my pentium then I'm thinkin that's bye bye pentium :D

    Btw when I touch the big heatsink that I'm using with pentium, I don't feel any heat at all while the smaller one on the Celeron is really hot :O

    Anyway the real question is still unanswered, why sudden changes in temp when there's load also how can it jump back to 36c and 42c as soon theres no load ?
    I dont think this heatsink can take heat off from processor that fast ??



    christo-tj said:
    spentshells said:
    That is how a CPU works, no problems mon..... temps go up at load and back down when not in use. You get sweaty when you run but you stop sweating when not running anymore.

    As for the fan always running that is either due to a a lack of proper fan controls/settings on your new motherboard or the cooler was not meant to dissipate that much heat so the fan if on auto is always running full blast.


    But not this fast. I mean if I start PS The temperature jumps to 55+ and as son as I close the app temperature returns to 36-40c(each cores). I don't think even liquid cooling can take off that much heat that fast.
    Also the heatsink is cold too when I touch it, when system is running.

    It only takes a couple seconds to bring the temperature down once the processor is idle.
  6. It only takes a couple seconds to bring the temperature down once the processor is idle.

    ok, i didn't know that... thanks :)
    ive converted a video file just to see how much the temp will go up, as soon as i started temp started to dance between 45-65(core 0, core 1 have always temp lower than core 0). dance means temp would change at every second jumping from 65 to 50 etc... is it normal?
  7. GhislainG said:
    christo-tj said:
    GhislainG said:
    A Pentium D can generate a lot of heat. You can't determine if a heat sink is efficient by it's size. Use the one that came with that CPU as it may be much better. Apply the correct amount of heat paste whan installing it, i.e., you only need as much as required to fill the voids between the HSF and the CPU.

    Agree that pentium generate a lot of heat. But I'm now
    Using the smaller heatsink with my old Celeron and the normal temperature is close to 60c. And if I use that with my pentium then I'm thinkin that's bye bye pentium :D

    Btw when I touch the big heatsink that I'm using with pentium, I don't feel any heat at all while the smaller one on the Celeron is really hot :O

    Anyway the real question is still unanswered, why sudden changes in temp when there's load also how can it jump back to 36c and 42c as soon theres no load ?
    I dont think this heatsink can take heat off from processor that fast ??



    christo-tj said:
    spentshells said:
    That is how a CPU works, no problems mon..... temps go up at load and back down when not in use. You get sweaty when you run but you stop sweating when not running anymore.

    As for the fan always running that is either due to a a lack of proper fan controls/settings on your new motherboard or the cooler was not meant to dissipate that much heat so the fan if on auto is always running full blast.


    But not this fast. I mean if I start PS The temperature jumps to 55+ and as son as I close the app temperature returns to 36-40c(each cores). I don't think even liquid cooling can take off that much heat that fast.
    Also the heatsink is cold too when I touch it, when system is running.

    It only takes a couple seconds to bring the temperature down once the processor is idle.


    The fan is going full blast as you mentioned....
  8. christo-tj said:

    It only takes a couple seconds to bring the temperature down once the processor is idle.

    ok, i didn't know that... thanks :)
    ive converted a video file just to see how much the temp will go up, as soon as i started temp started to dance between 45-65(core 0, core 1 have always temp lower than core 0). dance means temp would change at every second jumping from 65 to 50 etc... is it normal?


    Yes because the CPU isn't always 100% busy.
  9. Best answer
    The cores will almost always have different temps and yes the jumps are very normal and when not producing heat they will cool down quite quickly because as you mentioned the fan is blasting and the heatsink is very large and likely pretty good at getting rid of the heat especially when the fan is on full blast.
  10. thank you guys for the answers, i belive my heat sink and fan are doing a good job. at idle or with small load the temperatures of cores are; core 0= 40c, core1 = 36c. Room temperature is = 33c :O :D
Ask a new question

Read More

Temperature CPUs Dual Core Heatsinks Processors Intel