*UPDATE 4/17/11*
Somehow the BIOS set the CPU speed to 4.2 Ghz. I set it back to the standard 3.3 Ghz with 3.7 Ghz target for turbo. I ran the test again with the following results:
CPU-Z
Core Speed at 100% CPU Load- 3.4 GHz
Core Voltage at 100% CPU Load- 1.20 V
HWMonitor
Max Core Voltage- 1.23 V
Max Temperature- 76 C
RealTemp
Max Temperature- 79 C
This definitely helped bring down the temperature significantly (over 10 degrees), but it still has me a bit worried that I am getting a reading of almost 80 C at 100% CPU load.
-----
*UPDATE 4/17/11*
It seems that the flip flopping of temperature data was an issue with SpeedFan (possibly a bad install or download to begin with) because Real Temp gave me readings that made a lot more sense. I performed the Prime95's Blend Test with it and while I am still not enthused about the results, they are much better than before. I am now at 35-40*C with 0% CPU usage and I peaked at 90*C on one of the cores (the others were very close as well) at 100% CPU usage. This is still quite high and I plan to try reinstalling the cooler, trying a third temperature monitor to make sure Real Temp is accurate and it truly was SpeedFan, and I suppose I will get a new CPU cooler if all else fails. Any other suggestions are still appreciated.
-----
I finally finished building my PC and decided to run the tests suggested on the Tom'sHardware Step-by-Step Guide to Building a PC since all I could check before was the BIOS reading which showed my CPU running around 50*C. I chose to use SpeedFan to monitor my temperatures for the suggested test.
I installed Speedfan and gave my system a restart so I could start the test nice and fresh. I started up SpeedFan and began running Prime95’s Blend Test. I took a look at the digital readings and the graphical display and saw my CPU and AUX temps were both showing with a distressing flame next to their temperature readings with the AUX reading around 60*C and the CPU read from 80*C to 90*C from before the Blend test was started. Then right at the time of the Blend test, the CPU immediately dropped and stayed between 35*C and 45*C while the AUX dropped to around a constant 55*C. I ended the test, and then instantly, my CPU temperature shot up to 90*C and my AUX back up over 60*C.
This seems completely counter-intuitive to me. When my PC is idle, running absolutely no application the temperature is a dangerous 80*C plus. When I am running a stress test it drops by half to 40*C. What in the world could be happening? Why are the idle temperature in the OS so much higher than when I boot into the BIOS?
I am running the stock CPU cooler with the stock pre-applied thermal paste. Should I replace the thermal paste? The entire cooler? Is this even an issue with the cooler if it can reach 40*C?
Build
i5-2500K (no OC) with stock cpu cooler and pre-applied thermal paste
ASUS p6p87 B3LE
8GB 1066mhz
Corsair FS60 SSD
Samsung Spinpoint F3 1TB HDD
Antec 300 with stock 140mm and 120mm rear and top fans
Somehow the BIOS set the CPU speed to 4.2 Ghz. I set it back to the standard 3.3 Ghz with 3.7 Ghz target for turbo. I ran the test again with the following results:
CPU-Z
Core Speed at 100% CPU Load- 3.4 GHz
Core Voltage at 100% CPU Load- 1.20 V
HWMonitor
Max Core Voltage- 1.23 V
Max Temperature- 76 C
RealTemp
Max Temperature- 79 C
This definitely helped bring down the temperature significantly (over 10 degrees), but it still has me a bit worried that I am getting a reading of almost 80 C at 100% CPU load.
-----
*UPDATE 4/17/11*
It seems that the flip flopping of temperature data was an issue with SpeedFan (possibly a bad install or download to begin with) because Real Temp gave me readings that made a lot more sense. I performed the Prime95's Blend Test with it and while I am still not enthused about the results, they are much better than before. I am now at 35-40*C with 0% CPU usage and I peaked at 90*C on one of the cores (the others were very close as well) at 100% CPU usage. This is still quite high and I plan to try reinstalling the cooler, trying a third temperature monitor to make sure Real Temp is accurate and it truly was SpeedFan, and I suppose I will get a new CPU cooler if all else fails. Any other suggestions are still appreciated.
-----
I finally finished building my PC and decided to run the tests suggested on the Tom'sHardware Step-by-Step Guide to Building a PC since all I could check before was the BIOS reading which showed my CPU running around 50*C. I chose to use SpeedFan to monitor my temperatures for the suggested test.
I installed Speedfan and gave my system a restart so I could start the test nice and fresh. I started up SpeedFan and began running Prime95’s Blend Test. I took a look at the digital readings and the graphical display and saw my CPU and AUX temps were both showing with a distressing flame next to their temperature readings with the AUX reading around 60*C and the CPU read from 80*C to 90*C from before the Blend test was started. Then right at the time of the Blend test, the CPU immediately dropped and stayed between 35*C and 45*C while the AUX dropped to around a constant 55*C. I ended the test, and then instantly, my CPU temperature shot up to 90*C and my AUX back up over 60*C.
This seems completely counter-intuitive to me. When my PC is idle, running absolutely no application the temperature is a dangerous 80*C plus. When I am running a stress test it drops by half to 40*C. What in the world could be happening? Why are the idle temperature in the OS so much higher than when I boot into the BIOS?
I am running the stock CPU cooler with the stock pre-applied thermal paste. Should I replace the thermal paste? The entire cooler? Is this even an issue with the cooler if it can reach 40*C?
Build
i5-2500K (no OC) with stock cpu cooler and pre-applied thermal paste
ASUS p6p87 B3LE
8GB 1066mhz
Corsair FS60 SSD
Samsung Spinpoint F3 1TB HDD
Antec 300 with stock 140mm and 120mm rear and top fans