Differences in CPU Temp

[handscombmp]

I recently went to check my cpu temp and used three different programs to check it. Core Temp says around 38C Real Temp around 22C and Rivatuner around 22C again. Now normally i would say that two around the same means that is right but the ambient temp for the room the pc is in is 21C. Now i can't belive that my CPU is only 1C above room temp. Can anyone help me get to the bottom of this

[Will404]

I would guess that core temp is being more accurate, i have used it in the past, and it worked well. Riva tuner and real temp could be reading from the wrong sencer (possibly), you may be looking at one of the cores which has been idiling for a while, and core temp may be looking at another core, or the temp of the cpu as a whole

My aux is 25', one core is 27, one 27 one 28 and one 30. You have to factor in the gap for error as well, as the senors can be quite inaccurate.

Also check that you are not looking at the all time low for that temp(i duno if these programmes have one, but cpuid hw monitor does), as it could have dropped that low once, and since risen??

[Mithrandir]

I'd use Coretemp as the real reading

[cpemma]

Coretemp , and I bet if you tried Speedfan it would agree. Interesting the difference is close to 15C, twas a bug affecting some cpus in the older Speedfan version using the wrong Tjmax in a formula (85C not 100C).

[Thorsson]

It's to do with the value of TJMax assumed by the program when under load. At idle there are other reasons for the difference, and none of them are very accurate.

They all use the same sensors. Are these readings die temp (CPU), Core 1, Core 2, or ??? Take one reading after the computer doing nothing for 10 minutes. Take another after running Prime 95 for 10 minutes.

Real Temp should show you what value it's using for TJMax BTW.